Siemens / Murray MDH2150 Molded Case Circuit Breaker
- 150A
- 2 Pole
- Plug-On
Quantity
Siemens / Murray MDH2150 - 150A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for residential and commercial applications, this 150-amp main breaker provides reliable thermal-magnetic protection. It features a 2-pole configuration and delivers standard long-time and instantaneous trip functions for everyday electrical distribution. Designed as a drop-in replacement, it installs into older Murray and Siemens load centers without requiring modification. This legacy breaker is ideal for maintaining existing infrastructure and can be substituted by the QS2150H.Specifications
| Brand | Siemens / Murray |
|---|---|
| Part Number | MDH2150-R |
| Series | MDH |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load 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 |
| Accessories | Lugs Included |
|---|---|
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | Main Breaker, 22kA Interrupting Rating |
Product FAQs
6 answersWhich load centers accept the MDH2150 main breaker?
The MDH2150 is a plug-on main breaker designed specifically for legacy Murray and Siemens load centers. It serves as a direct fit for maintaining existing residential and commercial infrastructure.
What are the modern Siemens replacements for the legacy Murray MDH2150?
The Siemens QS2150H and HQS2150H serve as exact drop-in replacements for the MDH2150. The Siemens QN2150H is also a compatible substitute for this 150-amp main breaker.
What conductor sizes are supported by the MDH2150 terminals?
The included lugs are rated for both copper and aluminum wiring, accepting conductor sizes from 4 AWG up to 300 kcmil.
How does the trip unit on the MDH2150 operate?
It features a fixed thermal-magnetic trip unit with long-time and instantaneous (LI) functions. This provides reliable, non-adjustable protection against sustained overloads and sudden short circuits.
Is the MDH2150 approved for use as a service disconnect?
Yes, it is a UL 489 listed molded case circuit breaker. When installed in compatible Murray or Siemens enclosures, it meets standard safety requirements for main service disconnect applications.
Is the MDH2150 compatible with modular metering equipment?
Yes, this breaker is compatible with legacy Murray meter stacks and Siemens Power Mod metering systems that require a plug-on main tenant breaker.
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