{"title":"300 Amp Circuit Breakers","description":"\u003ch2\u003e300 Amp Circuit Breakers\u003c\/h2\u003e\u003cp\u003eShop 300 amp circuit breakers across leading brands and series. Filter 300A breakers by poles, voltage, series, mounting style, phase, special classification, trip technology, and family.\u003c\/p\u003e\u003cp\u003eMatch amperage, voltage, pole count, series, and mounting style to your equipment before ordering. Need help identifying a replacement? \u003ca href=\"\/pages\/get-a-quote\"\u003eRequest a quote\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"cutler-hammer-da3300-r-300-amp","title":"Eaton \/ Cutler-Hammer DA3300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Built to handle heavy-duty electrical distribution, this 300-amp molded case breaker features a fixed thermal-magnetic trip mechanism. It provides essential long-time and instantaneous protection for commercial facilities. The bolt-on configuration fits securely into Westinghouse CDP panelboards and FDP switchboards. For facilities updating their infrastructure, this unit is frequently substituted by the modern DK3300 equivalent.","brand":"Eaton \/ Cutler-Hammer","offers":[{"title":"Re-Certified","offer_id":45354343137593,"sku":"DA3300-R","price":1030.92,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/DA3300-R_5eebef46-db25-40c5-966d-d233a2555ca8.jpg?v=1686680137"},{"product_id":"siemens-jl3b300-r-300-amp","title":"Siemens JL3B300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Part of the legacy J-Frame series, the Siemens JL3B300 is a 3-pole, 300A molded case circuit breaker designed for industrial power distribution. It provides robust thermal-magnetic protection with fixed thermal and adjustable magnetic trip settings. This unit bolts into Siemens P4 and P5 panelboards, switchboards, and legacy ITE FC-1 panelboards. Rated for 35kA at 480VAC, this HACR-rated breaker features an interchangeable trip unit and can be substituted with the newer JD63B300 model.","brand":"Siemens","offers":[{"title":"Re-Certified","offer_id":45354632741177,"sku":"JL3B300-R","price":916.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/JL3B300-R_11aca352-1a28-4d9e-9f65-969b91a860a8.jpg?v=1686690530"},{"product_id":"cutler-hammer-l3300-r-300-amp","title":"Eaton \/ Cutler-Hammer L3300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Engineered for industrial power distribution, the Eaton L3300 provides 300A of continuous current handling. This 3-pole MCCB is part of the classic PB Frame family, designed to protect critical commercial circuits. It installs into compatible Westinghouse and Cutler-Hammer switchboards and motor control centers. Delivering a 30 kAIC interrupt rating at 480V, it utilizes an interchangeable trip unit with adjustable magnetic response and carries a HACR rating for HVAC loads.","brand":"Eaton \/ Cutler-Hammer","offers":[{"title":"Re-Certified","offer_id":45354742579513,"sku":"L3300-R","price":835.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/L3300-R_b26ae3d8-5fdb-4baf-a967-3e7b33672ee1.jpg?v=1686693429"},{"product_id":"westinghouse-la3300-r-300-amp","title":"Eaton \/ Cutler-Hammer LA3300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Engineered for heavy-duty industrial applications, the Eaton LA3300 delivers robust 300-amp overcurrent protection. This three-pole molded case circuit breaker utilizes a proven thermal-magnetic trip unit to safeguard critical electrical infrastructure. The unit installs into legacy Westinghouse PRL4 panelboards and motor control centers. Serving as an exact cross-reference for KD3300 models, it features an interchangeable trip unit with adjustable magnetic settings and a 30kA rating at 480V.","brand":"Eaton \/ Cutler-Hammer","offers":[{"title":"Re-Certified","offer_id":45354748051769,"sku":"LA3300-R","price":850.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/LA3300-R.jpg?v=1686693663"},{"product_id":"westinghouse-la3300pr-r-300-amp","title":"Eaton \/ Cutler-Hammer LA3300PR - 300A 3 Pole Molded Case Circuit Breaker","description":"Built for demanding industrial environments, this 300-amp Eaton Tri-Pac MCCB features specialized current-limiting technology. It pairs standard thermal-magnetic protection with internal fuses to rapidly clear high-level short circuits. This unit bolts into Westinghouse and Cutler-Hammer motor control centers. Facilities can also transition to the Series C LCL3300 equivalent. Boasting a 200 kAIC rating at 600V, it ensures reliable performance while drastically reducing let-through energy.","brand":"Eaton \/ Cutler-Hammer","offers":[{"title":"Re-Certified","offer_id":45354749395257,"sku":"LA3300PR-R","price":1909.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/LA3300PR-R.jpg?v=1686693674"},{"product_id":"westinghouse-lb3300-r-300-amp","title":"Eaton \/ Cutler-Hammer LB3300 - 300A 3 Pole Molded Case Circuit Breaker","description":"A drop-in replacement for aging distribution systems, the Eaton LB3300 is a 3-pole, 300A legacy MCCB. It utilizes an interchangeable thermal-magnetic trip unit, allowing facilities to maintain existing L-Frame infrastructure without a complete panel overhaul. Designed for secure bolt-on mounting, it is compatible with Pow-R-Line 4, Pow-R-Line C, and classic Westinghouse CDP enclosures. It crosses over to the Series C LD3300. It offers 30kAIC at 480V. Lug kits are sold separately.","brand":"Eaton \/ Cutler-Hammer","offers":[{"title":"Re-Certified","offer_id":45354765058361,"sku":"LB3300-R","price":728.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/lb3300_46c40799-cf39-40c4-af35-4346473f77d7.jpg?v=1686694146"},{"product_id":"siemens-shjd69300-300-amp","title":"Siemens SHJD69300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Engineered for industrial power distribution, the Siemens SHJD69300 is a 3-pole, 300A Sentron molded case circuit breaker. It utilizes a Sensitrip solid-state trip unit with adjustable long-time and instantaneous (LI) settings for precise coordination. This JD-frame breaker installs into Siemens Sentron panelboards, SB switchboards, and motor control centers. It serves as an exact replacement for legacy HJD63B300 models. Rated for 65 kAIC at 480VAC, it delivers high interrupting capacity.","brand":"Siemens","offers":[{"title":"New","offer_id":45355267096889,"sku":"SHJD69300","price":2049.24,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/SHJD69300_1.jpg?v=1686703917"},{"product_id":"siemens-sjd69300g-300-amp","title":"Siemens SJD69300G - 300A 3 Pole Molded Case Circuit Breaker","description":"Designed for advanced circuit protection, the Siemens SJD69300G is a 3-pole, 300A molded case circuit breaker. It is built for industrial facilities requiring precise electronic trip capabilities. This JD Frame breaker mounts into Siemens Sentron P4, P5, and SPP panelboards. For future system upgrades, it can be replaced by the Siemens 3VA Series using a retrofit kit. The Sensitrip III electronic trip unit features adjustable long-time, instantaneous, and ground fault (LIG) protection.","brand":"Siemens","offers":[{"title":"New","offer_id":45355278270777,"sku":"SJD69300G","price":2870.98,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/SJD69300G_1_dcc85a0f-c123-4cf9-8887-94022882faa9.jpg?v=1686704070"},{"product_id":"cutler-hammer-ks320300d-300-amp","title":"Eaton \/ Cutler-Hammer KS320300D - 300A 3 Pole Molded Case Circuit Breaker","description":"Part of the Eaton Series C family, the KS320300D is a K-frame, 3-pole, 300-amp molded case circuit breaker designed for commercial and industrial power distribution. It provides robust long-time and instantaneous (LI) protection for demanding electrical systems. This unit mount breaker installs into Eaton Series C panelboards, switchboards, and motor control centers. Rated at 65 kAIC at 240VAC, it features a non-interchangeable thermal-magnetic trip unit and includes line and load lugs.","brand":"Eaton \/ Cutler-Hammer","offers":[{"title":"New","offer_id":45356329107769,"sku":"KS320300D","price":950.16,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/ks320300d_36d3e095-796d-43cd-8ce7-e25f8285b203.jpg?v=1686717231"},{"product_id":"federal-pacific-njl631300-r-300-amp","title":"Federal Pacific NJL631300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Preserving the functionality of older electrical systems is straightforward with this 300A unit mount breaker. Designed for legacy Federal Pacific panelboards, it installs into your existing setup to restore power distribution without requiring adapter kits. The 3-pole device features a robust thermal-magnetic trip mechanism with adjustable magnetic settings. Rated for 42kAIC at 240VAC, it ensures reliable overcurrent defense and acts as an effective alternative to the NJL632300 model.","brand":"Federal Pacific","offers":[{"title":"Re-Certified","offer_id":45356851855673,"sku":"NJL631300-R","price":771.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/njl631300-r_44cafe20-d911-4930-9e5c-dccae7ee5d00.jpg?v=1686727741"},{"product_id":"siemens-km3b300-r-300-amp","title":"Siemens KM3B300 - 300A 3 Pole Molded Case Circuit Breaker","description":"A reliable solution for power distribution, the Siemens KM3B300 is a 300A, 3-pole molded case circuit breaker. It offers fixed thermal and adjustable magnetic trip functions to safeguard commercial and industrial electrical infrastructure. This unit installs into Siemens P4, P5, S4, and S5 panelboards and SB series switchboards. When transitioning to newer equipment, the HJD63B300 serves as its replacement. Operating at up to 600VAC, it provides a 50kA interrupting capacity at 480V.","brand":"Siemens","offers":[{"title":"Re-Certified","offer_id":45356862734649,"sku":"KM3B300-R","price":835.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/km3b300-r_69fa7d34-314d-4137-a93f-7564de710e2a.jpg?v=1686728145"},{"product_id":"siemens-jd63b300-3-pole-circuit-breaker-new","title":"Siemens JD63B300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Built for heavy-duty commercial applications, the Siemens JD63B300 is a 300A, 3-pole molded case circuit breaker with an interchangeable thermal-magnetic trip unit for reliable LI protection. The JD6 frame breaker mounts into Siemens Sentron panelboards and switchboards. It comes standard with TA2J6500 lugs, accepting 3\/0 AWG to 500 kcmil conductors. Offering a 65kAIC rating at 240VAC, this unit is replaced by the 3VA5330-5EC31-0AA0 (requires an adapter kit).","brand":"Siemens","offers":[{"title":"New","offer_id":45357521502521,"sku":"JD63B300","price":1791.0,"currency_code":"USD","in_stock":true},{"title":"Re-Certified","offer_id":45357521535289,"sku":"JD63B300-R","price":910.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/JD63B300_cee91aac-2e43-4522-89f5-2dbb0590cccf.jpg?v=1686737677"},{"product_id":"siemens-jj63b300-r","title":"Siemens JJ63B300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Built for demanding industrial applications, the Siemens JJ63B300 is a 3-pole, 300A circuit breaker rated for 600VAC systems. It utilizes a rugged J-Frame construction to handle commercial power distribution. The breaker mounts into Siemens P4 and P5 panelboards using a secure bolt-on connection. For facilities maintaining legacy equipment, it provides an exact fit and cross-references with the newer JXD63B300 replacement.","brand":"Siemens","offers":[{"title":"Re-Certified","offer_id":45357525991737,"sku":"JJ63B300-R","price":1253.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/jj63b300_859776a0-5beb-4abe-aeb7-19b80cbe7b01.jpg?v=1686737780"},{"product_id":"cutler-hammer-kdc3300-300-amp","title":"Eaton \/ Cutler-Hammer KDC3300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Designed for high-fault environments, the Eaton KDC3300 is a 3-pole, 300A Series C molded case circuit breaker. It utilizes fixed thermal and adjustable magnetic trip functions to safeguard industrial power networks. This K-Frame device installs into Eaton motor control centers, switchboards, and Series C panelboards. It includes standard lugs that accept 3 AWG to 350 kcmil conductors. With a 100 kAIC rating at 480VAC, it provides exceptional current-limiting performance and is HACR rated.","brand":"Eaton \/ Cutler-Hammer","offers":[{"title":"New","offer_id":45357557252409,"sku":"KDC3300","price":4246.38,"currency_code":"USD","in_stock":true},{"title":"Re-Certified","offer_id":51137473380665,"sku":"KDC3300-R","price":1975.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/files\/HKD3000-3-Pole-Circuit-Breaker-Eaton-1_0b8132be-485e-4273-8c9e-a48071f493bd.jpg?v=1769622948"},{"product_id":"siemens-jxd23b300-3-pole-circuit-breaker","title":"Siemens JXD23B300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Delivering high-capacity protection, the JXD23B300 is a 300A molded case circuit breaker from the Siemens Sentron series. It safeguards commercial and industrial electrical systems against overloads. This JD frame breaker features a bolt-on mounting style, fitting into Siemens Sentron, P4, and P5 panelboards, as well as SB switchboards. It replaces the older JD63B300 model. Equipped with a thermal-magnetic trip unit, it provides a 65kAIC rating at 240VAC. Lugs are sold separately.","brand":"Siemens","offers":[{"title":"New","offer_id":51149422559545,"sku":"JXD23B300","price":1731.37,"currency_code":"USD","in_stock":true},{"title":"Re-Certified","offer_id":51205995757881,"sku":"JXD23B300-R","price":699.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/files\/JXD63B300-3-Pole-Circuit-Breaker_Siemens_1_b2a08709-0723-4279-82b5-322d3b18c340.jpg?v=1781522438"},{"product_id":"siemens-jxd63b300h-300-amp","title":"Siemens JXD63B300H - 300A 3 Pole Molded Case Circuit Breaker","description":"The JXD63B300H is a 3-pole, 300A molded case circuit breaker from Siemens' Sentron series. Built for commercial and industrial power distribution, this JD frame breaker provides robust long-time and instantaneous (LI) protection for demanding electrical systems. It installs into Siemens P4, P5, S4, and S5 panelboards, along with compatible switchboards. Rated for 35kAIC at 480VAC, this breaker features a 100% continuous current rating, allowing you to utilize the full 300A capacity.","brand":"Siemens","offers":[{"title":"New","offer_id":51149423673657,"sku":"JXD63B300H","price":2084.48,"currency_code":"USD","in_stock":true},{"title":"Re-Certified","offer_id":51224466817337,"sku":"JXD63B300H-R","price":1379.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/files\/JXD63B300-3-Pole-Circuit-Breaker_Siemens_1_2a79b3df-32a1-4f19-9692-bf9098589111.jpg?v=1765468475"},{"product_id":"westinghouse-lm3300-r","title":"Eaton \/ Westinghouse LM3300-R - 300A 3 Pole Molded Case Circuit Breaker","description":"Rated for 300 amps, the Eaton LM3300 is a 3-pole molded case circuit breaker belonging to the Series C family. This robust L-Frame component ensures dependable thermal-magnetic protection. This unit installs into older Westinghouse panelboards, switchboards, and motor control centers. As a legacy component, it provides a direct fit for existing setups and can be substituted with the KD3300.","brand":"Eaton \/ Westinghouse","offers":[{"title":"Re-Certified","offer_id":45357629767993,"sku":"LM3300-R","price":1073.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/lm3300_8b12e1ea-db7a-495e-9fc7-92f74c5e33a3.jpg?v=1686740032"},{"product_id":"sylvania-sjk-3c-300-r","title":"Zinsco \/ Sylvania SJK-3C-300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Manufactured for heavy-duty industrial environments, the 300A SJK-frame breaker provides reliable overcurrent protection for 600VAC systems. It utilizes a thermal-magnetic trip mechanism to handle demanding commercial loads. This bolt-on unit serves as an exact fit for discontinued Sylvania, Challenger, and Westinghouse panelboards. For modern upgrades, the Eaton KD3300 acts as the current substitute. Rated to interrupt 30kA faults at 480VAC, it delivers robust performance.","brand":"Zinsco \/ Sylvania","offers":[{"title":"Re-Certified","offer_id":45357650870585,"sku":"SJK-3C-300-R","price":646.05,"currency_code":"USD","in_stock":false}]},{"product_id":"general-electric-thj4v2603-r","title":"ABB \/ General Electric THJ4V2603 - 300A 3 Pole Molded Case Circuit Breaker","description":"Engineered for heavy-duty industrial applications, this 300A GE molded case circuit breaker delivers robust electrical protection. It mounts into legacy GE J-Frame enclosures and motor control centers, and can be substituted with a Tmax XT5 via retrofit kit. The breaker utilizes a Power+ 4 electronic trip unit with adjustable LI functions, providing a 65kAIC rating at 240VAC and interchangeable rating plugs for maximum system flexibility.","brand":"ABB \/ General Electric","offers":[{"title":"Re-Certified","offer_id":45357879427385,"sku":"THJ4V2603-R","price":889.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/thj4v2603_a4e1514a-c39b-47d6-9027-a1a6bc40fad7.jpg?v=1686745956"},{"product_id":"square-d-mh36300-r-3-pole-circuit-breaker-new","title":"Square D MH36300 - 300A 3 Pole Molded Case Circuit Breaker","description":"Designed for rapid installation, this 300A molded case circuit breaker delivers reliable long-time and instantaneous protection. The unit features an I-Line mounting style, allowing it to plug securely into compatible Square D switchboards. 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It features a Sensitrip solid-state trip unit with comprehensive LSIG protection, allowing adjustments for long-time, short-time, instantaneous, and ground-fault settings. This JD-frame breaker mounts into Siemens Sentron panelboards and SB switchboards. It is an exact substitute for the discontinued SHJD6B300LSIG. Rated 65 kAIC at 480VAC, it provides true RMS sensing for superior accuracy.","brand":"Siemens","offers":[{"title":"New","offer_id":45357966459193,"sku":"SHJD69300NGT","price":6381.86,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/SHJD69300NGT_dbcb18cb-175a-4a90-9233-ea9ae9e49191.jpg?v=1686747371"},{"product_id":"siemens-sjd69300ngt-300-amp","title":"Siemens SJD69300NGT - 300A 3 Pole Molded Case Circuit Breaker","description":"The Siemens SJD69300NGT is a 3-pole, 300A molded case circuit breaker engineered for demanding commercial and industrial environments. 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This unit-mount breaker integrates into Siemens P4 and P5 panelboards, switchboards, and enclosures. It accommodates 3\/0 AWG to 500 kcmil conductors. The fuseless, current-limiting architecture delivers a 200kAIC rating at 240VAC. It includes a thermal-magnetic trip unit with adjustable magnetic response (LI).","brand":"Siemens","offers":[{"title":"New","offer_id":51149428916537,"sku":"CJD63B300","price":4699.63,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/6978\/0537\/products\/CJD63B300_90977626-5583-4892-b8b9-583fe2036e55.jpg?v=1686747699"},{"product_id":"siemens-shjd69300nt-300-amp","title":"Siemens SHJD69300NT - 300A 3 Pole Molded Case Circuit Breaker","description":"Built for robust industrial applications, the Siemens SHJD69300NT is a 3-pole, 300A Sentron JD-frame MCCB. It is equipped with a Sensitrip electronic trip unit providing adjustable long-time, short-time, and instantaneous (LSI) protection for precise coordination. 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