Siemens J3B175 Molded Case Circuit Breaker
- 175A
- 3 Pole
- Bolt-On
Quantity
Siemens J3B175 - 175A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Operating at up to 600VAC, the Siemens J3B175 is a 3-pole, 175-amp molded case circuit breaker. It utilizes fixed thermal and adjustable magnetic trip technology to protect commercial and industrial electrical systems. This legacy J-Frame unit bolts into Siemens P4 and P5 panelboards, switchboards, and MCCs. For modern replacements, the FXD63B175 serves as the substitute but requires an FD frame mounting kit. With an interrupting capacity of 25kA at 240VAC, it handles significant fault currents.Specifications
| Brand | Siemens |
|---|---|
| Part Number | J3B175-R |
| Series | J |
| Amperage | 175A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | J |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 300 kcmil (Cu/Al) |
| Max Wire | 300 kcmil |
| Min Wire | 4 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, Padlock Attachment, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
5 answersWhat is the modern replacement for the legacy Siemens J3B175 circuit breaker?
The FXD63B175 is the modern substitute for the legacy J3B175. However, because the FXD63B175 uses an FD frame rather than the original J frame, transitioning to the newer breaker requires an updated mounting strap kit.
Which Siemens panelboards are compatible with the J3B175 breaker?
This bolt-on molded case circuit breaker is designed for installation in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards and motor control centers.
Does the J3B175 feature an adjustable trip unit?
Yes, it features a thermal magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection.
How does the 3-pole configuration of the J3B175 protect three-phase equipment?
The 3-pole design provides synchronized protection across all three phases. If a fault occurs on any single phase, the internal common trip mechanism disconnects all three poles simultaneously, preventing single-phasing damage to connected motors and drives.
What are the typical applications for the J3B175 circuit breaker?
With its 175A capacity and 600VAC maximum rating, this breaker is commonly used to feed large distribution panels or protect heavy three-phase industrial loads, including motors, pumps, and compressors.
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Reviews
Review summary
Customers rate this product 4.0 out of 5 based on 1 review.
- MCMARK C.Verified BuyerReviewingITE/Siemens J20M Control RelayI recommend this productRated 4 out of 5 stars2/4/26it control relay but it was just the coil for the relay. do you have a J20A40 CONTACTS?
it control relay but it was just the coil for the relay. do you have a J20A40 CONTACTS?