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Siemens JD3B300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Siemens
JD3B300
Molded Case Circuit Breaker
Brand
Siemens
SKU
JD3B300
Quantity
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Siemens JD3B300 - 300A 3 Pole Molded Case Circuit Breaker
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Description
Providing robust 300A protection, the Siemens JD3B300 is a 3-pole molded case circuit breaker designed for industrial applications. It features an interchangeable thermal-magnetic trip unit with fixed thermal and adjustable magnetic functions. This unit mount breaker is compatible with Siemens Sentron P4 and P5 panelboards, motor control centers, and switchboards. It is a legacy component replaced by the JD63B300. The JD frame MCCB offers a 65kAIC rating at 240VAC and is fully HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JD3B300 |
| Series | JD |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 30kA @ 250VDC, 25kA @ 500VDC |
| Frame Type | JD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (Type P4, P5), Switchboards, Enclosures, Motor Control Centers |
| Wire Gauge | (2) 3/0 AWG - 500 kcmil (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs (TA2J6500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
6 answersWhat types of equipment are compatible with the JD3B300?
This JD-frame breaker is designed for use in Siemens Sentron Type P4 and P5 panelboards. It is also compatible with Siemens switchboards, motor control centers, and standalone enclosures that accept unit-mount JD-frame breakers.
What wire sizes and materials are accepted by the JD3B300 terminals?
The standard lugs on this breaker accept two 3/0 AWG to 500 kcmil conductors per phase. The terminals are rated for both copper and aluminum wire.
How does the trip unit function on this breaker?
It features a thermal-magnetic trip unit with a fixed thermal element for overload protection and an adjustable magnetic element for short-circuit protection. The adjustable magnetic trip allows electricians to coordinate with downstream devices and prevent nuisance tripping from motor inrush currents.
Does the JD3B300 require a specific mounting configuration?
Yes, this is a unit-mount, bolt-on circuit breaker. It must be bolted directly to the bus or mounting pan in compatible panelboards or enclosures to ensure a secure mechanical and electrical connection.
Can this breaker be used in DC applications?
Yes, the JD3B300 is rated for DC systems. It provides up to 30kA interrupting capacity at 250VDC and 25kA at 500VDC, making it suitable for industrial DC power distribution.
What safety functions does the LI trip code indicate?
The LI designation means the breaker provides Long-Time and Instantaneous protection. Long-Time protects against sustained overloads, while Instantaneous immediately clears high-level short circuits to protect equipment and personnel.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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2 reviews
- DCDanielson C.ReviewingSiemens JD63F400 FrameI recommend this productRated 5 out of 5 stars1/17/24Perfect
Just what I was looking for!
- IHIsaac H.Rated 5 out of 5 stars3/11/21GREAT STUFF
GOOD PRODUCTS AT A GREAT PRICE