Siemens JK3B150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Bolt-On
Quantity
Siemens JK3B150 - 150A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed for heavy electrical loads, the Siemens JK3B150 is a 3-pole, 150A molded case circuit breaker. It delivers reliable long-time and instantaneous trip functions. This J-frame device features a bolt-on connection compatible with Siemens P4, P5, SB1, SB2, and S5 panelboards. It is replaced by the FXD63B150, which requires new mounting hardware. With a 25kAIC rating at 240VAC, it offers fixed thermal and adjustable magnetic protection. It is HACR rated and approved for reverse feed.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JK3B150 |
| Series | JK |
| Amperage | 150A |
| 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
6 answersWhat panelboards and switchboards are compatible with the Siemens JK3B150?
This bolt-on circuit breaker is designed for use in Siemens P4, P5, SB1, SB2, and S5 panelboards, as well as compatible Siemens switchboards.
What wire sizes are accepted by the standard lugs on the JK3B150?
The standard lugs accept copper or aluminum (Cu/Al) conductors ranging from 4 AWG to 350 kcmil. Ensure proper torque specifications are followed during installation.
Does the JK3B150 feature adjustable trip settings?
Yes, this thermal-magnetic breaker features a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection.
Is the Siemens JK3B150 a current production breaker?
The JK3B150 is part of the legacy Siemens J-Frame molded case circuit breaker family. It is commonly used as a direct replacement in existing P4, P5, and S5 panelboards.
What is the modern replacement for the legacy JK3B150?
The legacy JK3B150 is typically replaced by the FXD63B150. Note that upgrading to the newer FXD frame will require a new mounting strap kit or hardware for proper installation in existing enclosures.
Is the JK3B150 suitable for reverse feed applications?
Yes, the JK3B150 is approved for reverse feed applications and is HACR rated for use with heating, air conditioning, and refrigeration equipment.
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