Siemens / Murray ET-3225 Molded Case Circuit Breaker
- 225A
- 3 Pole
- Bolt-On
Siemens / Murray
ET-3225
Molded Case Circuit Breaker
Brand
Siemens / Murray
SKU
ET-3225
Quantity
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Siemens / Murray ET-3225 - 225A 3 Pole Molded Case Circuit Breaker
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225A 3 Pole Molded Case Circuit Breaker
225A 3 Pole Molded Case Circuit Breaker
225A 3 Pole Molded Case Circuit Breaker
Description
Built for demanding commercial environments, this 3-pole 225A molded case circuit breaker provides robust protection with a fixed thermal and adjustable magnetic trip. The legacy bolt-on MCCB installs seamlessly into Siemens and ITE panelboards, switchboards, and motor control centers. It serves as an exact replacement for older systems and is fully cross-referenced with JD63B225 models. This breaker delivers interrupting ratings of 25kA at 240VAC, 18kA at 480VAC, and 14kA at 600VAC.Specifications
| Brand | Siemens / Murray |
|---|---|
| Part Number | ET-3225 |
| Series | ET |
| Amperage | 225A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens / ITE Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| 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, Lug Kits, Alarm Switch |
|---|---|
| Accessories | Adjustable Magnetic Trip (960-2000A) |
| Standards | UL 489, NEMA AB-1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
Product FAQs
5 answersIs the ET-3225 suitable for standard residential load centers?
No. This is an E-frame, bolt-on molded case circuit breaker designed specifically for commercial and industrial applications. It must be installed in compatible Siemens or ITE panelboards, switchboards, or motor control centers.
How does the trip unit on the ET-3225 operate?
It utilizes a thermal-magnetic trip unit with LI (Long-Time, Instantaneous) functions. The thermal element provides fixed overload protection, while the magnetic element is adjustable, allowing electricians to customize the instantaneous short-circuit response based on the specific load.
Are Siemens and Murray ET-3225 breakers interchangeable?
Yes. Siemens acquired the Murray brand and consolidated their legacy product lines. An ET-3225 breaker may feature either Siemens or Murray branding, but they share the same E-frame physical dimensions and electrical characteristics for direct replacement.
What type of conductors are compatible with the ET-3225 lugs?
The included lugs are rated for both aluminum and copper conductors ranging from 4 AWG to 350 kcmil. Always apply an approved oxide inhibitor when terminating aluminum wiring to prevent corrosion and ensure a secure connection.
What safety precautions are required when adjusting the magnetic trip settings?
Only qualified personnel should adjust the instantaneous magnetic trip dial. The circuit must be completely de-energized and locked out before making any modifications to the trip settings to prevent arc flash hazards and ensure personnel safety.
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