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Siemens JD3B250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Siemens
JD3B250
Molded Case Circuit Breaker
Brand
Siemens
SKU
JD3B250
Quantity
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Siemens JD3B250 - 250A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty commercial use, the Siemens JD3B250 is a 3-pole, 250A molded case circuit breaker. It utilizes thermal-magnetic trip technology with adjustable magnetic settings to ensure reliable overcurrent and short-circuit protection. Designed for unit mounting, it fits seamlessly into Siemens Sentron P4 and P5 panelboards, switchboards, and enclosures. Note that this model is replaced by the JD63B250. This JD frame breaker delivers a 65kAIC rating at 240VAC and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JD3B250 |
| Series | JD |
| Amperage | 250A |
| 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 | (1) 3/0 AWG - 500 kcmil (Cu), (1) 4/0 AWG - 500 kcmil (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
8 answersWhat panelboards are compatible with the Siemens JD3B250?
The JD3B250 is designed for unit mounting and fits into Siemens Sentron P4 and P5 panelboards, as well as compatible switchboards, enclosures, and motor control centers.
What mounting hardware is required to install this breaker in a P4 or P5 panelboard?
To install the JD3B250 in a Siemens P4 or P5 panelboard, you will need a JD frame breaker mounting strap kit. Common kits include the SNB for P4 panels, the SNBD for P5 panels, or the SJ1D single-branch mounting hardware kit.
What lugs are standard for the JD3B250, and what wire sizes do they accept?
The standard line and load lugs for this breaker are the TA2J6500 aluminum body lugs. These lugs accept 3/0 AWG to 500 kcmil copper wire or 4/0 AWG to 500 kcmil aluminum wire.
Are there copper lug options available for the JD3B250?
Yes, if copper-only terminations are required, you can use the TC2J6500 copper body lug kit. This lug supports copper wire sizes from 3/0 AWG up to 500 kcmil.
What does the LI trip function code mean on the JD3B250?
The LI designation indicates that the thermal-magnetic trip unit features Long-Time (L) and Instantaneous (I) protection. It has a fixed thermal element for overload protection and an adjustable magnetic element for short-circuit protection.
Is the JD3B250 HACR rated?
Yes, the JD3B250 is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment.
Is the JD3B250 still the current model, or has it been replaced?
The JD3B250 is an older JD frame model and has been directly replaced by the newer Siemens JD63B250 molded case circuit breaker.
How should the lug terminals be torqued during installation?
Always torque the line and load lugs to the exact specifications printed on the breaker faceplate or the lug itself. If no values are listed on the device, refer to the hardware tightening torque label affixed to the rear of the panelboard deadfront.
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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
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