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Siemens JD3B400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Siemens
JD3B400
Molded Case Circuit Breaker
Brand
Siemens
SKU
JD3B400
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Siemens JD3B400 - 400A 3 Pole Molded Case Circuit Breaker
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Description
A reliable choice for commercial power distribution, the Siemens JD3B400 is a 3-pole, 400-amp molded case circuit breaker from the JD frame family. It provides long-time and instantaneous (LI) trip functions with an adjustable magnetic setting to fine-tune protection. Designed for unit-mount applications, it integrates seamlessly into Siemens P4 and P5 panelboards and switchboards. While officially replaced by the JD63B400, this breaker is frequently required for legacy equipment support.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JD3B400 |
| Series | JD |
| Amperage | 400A |
| 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
5 answersWhich Siemens panelboards accept the JD3B400 breaker?
This unit-mount breaker is designed to integrate into Siemens Sentron P4 and P5 panelboards. It is also compatible with Siemens switchboards and motor control centers.
Is there a direct modern replacement for the JD3B400?
Yes, while the JD3B400 is frequently required for servicing legacy equipment, its official modern replacement in the Siemens catalog is the JD63B400.
How does the adjustable magnetic trip benefit panel builders?
The adjustable magnetic setting allows electricians to fine-tune the instantaneous trip point. This provides better selective coordination with downstream devices and helps prevent nuisance tripping from motor inrush currents.
How many conductors can the standard lugs on the JD3B400 accept?
The standard lugs are designed to accept two conductors per phase, accommodating wire sizes from 3/0 AWG to 500 kcmil for both copper and aluminum wire.
Can the trip unit on the JD3B400 be swapped out?
Yes, the JD3B400 is built with an interchangeable trip unit. This allows the thermal-magnetic trip functions to be replaced or upgraded without removing the entire breaker frame from the panel.
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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