ABB / General ElectricTEY350ST12
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
ABB / General Electric TEY340ST12 Miniature Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
ABB / General Electric
TEY340ST12
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
TEY340ST12
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ABB / General Electric TEY340ST12 - 40A 3 Pole Miniature Circuit Breaker
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Description
Part of GE's Q-Line series, the TEY340ST12 is a 3-pole, 40A miniature circuit breaker designed for advanced commercial applications. It comes equipped with a factory-installed shunt trip (120-277VAC), allowing the breaker to be tripped remotely for emergency shutdowns. Designed for seamless integration, this breaker mounts into GE A-Series panelboards using a reliable bolt-on connection. Delivering 14kAIC at 480Y/277VAC, it utilizes fixed thermal-magnetic trip technology and is HACR rated.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | TEY340ST12 |
| Series | TEY |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC, 250VDC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 120VAC, 65kA @ 240VAC, 14kA @ 480Y/277VAC, 10kA @ 250VDC, 65kA @ 120/240VAC |
| Frame Type | TEY |
|---|---|
| Terminal Type | Lugs |
| For Use With | GE A-Series Panelboards |
| Wire Gauge | 10-4 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 4 AWG |
| Min Wire | 10 AWG (Cu), 8 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Undervoltage Release, Bell Alarm, Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Shunt Trip (120-277VAC) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, HID, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards accept the TEY340ST12 circuit breaker?
This Q-Line TEY frame breaker mounts directly into GE A-Series panelboards using a bolt-on connection.
What does the ST12 suffix mean on the TEY340ST12 catalog number?
The ST12 suffix indicates the breaker comes with a factory-installed shunt trip accessory. It operates on a 120 to 277VAC control voltage, allowing the breaker to be opened remotely for emergency shutdowns or automated control applications.
What wire gauge and material can be used with the TEY340ST12 lugs?
The factory lugs accept 10 to 4 AWG copper (Cu) wire or 8 to 4 AWG aluminum (Al) wire.
Is the TEY340ST12 rated for use on DC systems?
Yes, in addition to its AC ratings (14kAIC at 480Y/277VAC and 65kAIC at 120/240VAC), this breaker is rated for 10kAIC at 250VDC.
Can the trip settings on the TEY340ST12 be adjusted in the field?
No, this breaker features a fixed thermal magnetic trip unit with non-interchangeable long-time and instantaneous (LI) functions.
Why might my TEY340ST12 breaker arrive with ABB branding instead of GE?
ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, the TEY340ST12 may feature either ABB or GE branding. Both versions are manufactured to the exact same specifications and are fully interchangeable.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 43 reviews.
Reviews Summary
Generated by AI from 43 most recent customer reviews
Last updated 9/22/26
Customers say these circuit breakers arrive quickly and function as described. Many reviews highlight fast shipping, often within 48 hours, and reasonable pricing compared to local alternatives. Users appreciate the extensive inventory and ability to find hard-to-locate models in stock. The ordering process is described as straightforward, and products consistently arrive well-packaged and as advertised. Common feedback addresses knowledgeable staff and reliable service. A few customers note that shipping tracking information could be more detailed, though delivery timeliness remains consistent across reviews.
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Rating
43 reviews
- SAShaenon A.Verified BuyerReviewingGeneral Electric TEYL1030B 1 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars9/21/26Everything was great!
Super easy and love the options and simple descriptions! Reasonable pricing too will ensure we are a reoccurring customer!
- MJmartin j.Verified BuyerReviewingABB / General Electric TEY320 - 20A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/26/26breaker replacement
fast service and great pricing .. Had this business up and running in No time ,, highly recommend SB
- CMCharles M.Verified BuyerReviewingABB / General Electric TEY320 - 20A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/4/26Just what I needed.
Received as advertised, and at a good price on time. Very satisfied.
- AMAlex M.Verified BuyerReviewingABB / General Electric TEY340 - 40A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars5/12/26SuperBreakers are great.
Another breaker ordered. Arrived on time and fulfilled.
- AMAlex M.Verified BuyerReviewingABB / General Electric TEY130 - 30A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars5/12/26Breaker Ordered
Shipped correctly and on time. We will continue to use SuperBreakers!