Siemens JK3B175 Molded Case Circuit Breaker
- 175A
- 3 Pole
- Bolt-On
Quantity
Siemens JK3B175 - 175A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built to support legacy infrastructure, this 175-amp molded case circuit breaker delivers essential thermal-magnetic protection for three-phase circuits. The bolt-on design fits seamlessly into Siemens SB1, SB2, and S5 switchboards, as well as P4 and P5 panelboards. With an interrupting capacity of 25kA at 240VAC and 14kA at 600VAC, it handles standard commercial fault levels. Facilities looking to upgrade can transition to the newer FXD63B175 substitute using an updated mounting strap kit.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JK3B175-R |
| Series | JK |
| Amperage | 175A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 22kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | JK |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5, SB1, SB2, S5 Panelboards, Switchboards |
| Wire Gauge | 4 AWG - 350 kcmil (Cu/Al) |
| Max Wire | 350 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 |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
5 answersWhich panelboards accept the JK3B175 circuit breaker?
This bolt-on breaker is designed for installation in Siemens P4, P5, SB1, SB2, and S5 panelboards, as well as compatible Siemens switchboards.
What type of trip unit is equipped on this breaker?
It features a thermal magnetic trip unit with a fixed thermal element for overload protection and an adjustable magnetic element. This allows installers to modify the instantaneous short-circuit trip threshold for proper coordination with downstream devices.
What conductor sizes are supported by the standard lugs?
The included lugs are rated for both copper and aluminum wire, accepting conductor sizes from 4 AWG up to 350 kcmil.
Is the JK3B175 considered a current production model?
No, the JK frame is part of the Siemens legacy molded case circuit breaker family. It is primarily sourced to maintain or expand existing infrastructure without the need to retrofit the panelboard for newer breaker frames.
Are mounting screws or strap kits included with the breaker?
Mounting hardware and strap kits are typically sold separately. You will need the specific strap kit designed for your exact panelboard type (such as P4 or P5) to properly mount a J frame breaker.
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