Siemens / Murray MQJ2150 Molded Case Circuit Breaker
- 150A
- 2 Pole
- Unit Mount
Quantity
Siemens / Murray MQJ2150 - 150A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for residential and commercial use, the Siemens MQJ2150 provides 150A of thermal-magnetic protection. This 2-pole unit mount MCCB offers reliable long-time and instantaneous trip functions. It installs into compatible Murray and Siemens load centers or metering equipment. As a legacy component, it is officially replaced by the QJ22B150, ensuring an exact fit without aftermarket adapters. This QJ-frame breaker is HACR rated and features a 10kAIC interrupt capacity at 240VAC.Specifications
| Brand | Siemens / Murray |
|---|---|
| Series | MQJ |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | MP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Murray and Siemens Load Centers, Metering Equipment |
| Wire Gauge | 6 AWG - 300 kcmil (Cu), 4 AWG - 300 kcmil (Al) |
| Max Wire | 300 kcmil |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, Common Trip |
Product FAQs
6 answersWhat is the direct Siemens replacement for the Murray MQJ2150?
The Murray MQJ2150 is a legacy component that is officially replaced by the Siemens QJ22B150. The QJ22B150 provides an exact hardware match for older Murray and Siemens metering equipment without requiring aftermarket adapters.
Can I install the MQJ2150 in a standard residential plug-on load center?
No, the MQJ2150 is a unit mount, bolt-on breaker belonging to the QJ/QR frame group. It does not snap onto standard plug-on bus bars and requires a panel or metering enclosure specifically designed to accept bolt-on main or branch breakers.
What wire sizes and materials are compatible with the MQJ2150 lugs?
The factory-installed lugs accept both copper (Cu) and aluminum (Al) conductors. The acceptable wire range is 6 AWG to 300 kcmil for copper, and 4 AWG to 300 kcmil for aluminum.
Is the MQJ2150 breaker HACR rated?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific certification.
What type of trip unit does the MQJ2150 use?
This breaker features a non-interchangeable thermal-magnetic trip unit with fixed long-time and instantaneous (LI) functions. It provides reliable overload and short-circuit protection without adjustable trip dials.
Are Murray and Siemens QJ-frame breakers interchangeable?
Yes, Siemens acquired Murray, and the MQJ2150 is approved for use in compatible Murray and Siemens load centers, as well as specific metering equipment. Always verify your panel labeling to ensure QJ/QR frame bolt-on breakers are permitted.
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