Free Shipping Over $99
Siemens MP330 Miniature Circuit Breaker
- 30A
- 3 Pole
- Plug-On
Siemens
MP330
Miniature Circuit Breaker
Brand
Siemens
SKU
MP330
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Siemens MP330 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
Similar Items
Description
Built for commercial and industrial applications, the MP330 is a 30A, three-pole miniature circuit breaker. It provides robust thermal-magnetic protection for 240VAC systems against overcurrents. Designed with a plug-on mount, it installs into Murray and Siemens load centers. Because the Murray MP line is discontinued, the Siemens Q330 serves as the UL-approved substitute for panel maintenance. This 10kAIC rated breaker features Insta-Wire technology for faster wiring and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | MP330 |
| Series | MP |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load Centers |
| Wire Gauge | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Standards | HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Insta-Wire |
Product FAQs
5 answersWhich electrical panels accept the MP330 circuit breaker?
This plug-on breaker is designed for Siemens and legacy Murray load centers that accept full-size, 1-inch per pole breakers. You must verify that your specific panel label lists type MP or QP breakers as acceptable.
Is the Siemens MP330 the same as the Murray MP330?
Yes. Siemens owned the Murray brand and manufactured both lines. The Siemens MP330 is the exact same breaker as a legacy Murray MP330, making it the direct replacement for older Murray panels.
What wire gauges are compatible with the MP330 terminals?
The load lugs accept 14 to 6 AWG copper wire, or 12 to 6 AWG aluminum wire. Always torque the terminal screws to the specifications printed directly on the breaker label to ensure a secure connection.
How does the thermal-magnetic trip function work on the MP330?
The breaker uses a fixed thermal element to respond to gradual heat buildup from sustained overloads, and a magnetic element that trips instantaneously when it detects a high-current short circuit.
How much space does the MP330 take up in a load center?
The MP330 is a full-size breaker that requires three adjacent 1-inch spaces on the panel bus bar.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 4 reviews.
Total 5 star reviews: 4 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Search
Rating
4 reviews
- JVJulie V.Verified BuyerReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars3/5/26on breaker
so far so good on the refurbished breaker
- JFJon F.ReviewingSiemens / Murray MP250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars12/17/20Sales
Fantastic group to work with...
- DSDavid S.ReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars1/5/20Thank you so much for
Thank you so much for sending me a 100 amp breaker that was in the condition that you said it would be in.With out your breaker I would still be in the dark Thank you David
- RARichard A.ReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/13/19Awesome!
Your prices and number of available items to choose from is Awesome!