--- product_id: 512080106 title: "Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip" brand: "westinghouse" price: "$44.74" currency: USD in_stock: true reviews_count: 8 url: https://www.desertcart.us/products/512080106-westinghouse-ul-489-ac-miniature-circuit-breaker-30-amp-single store_origin: US region: United States of America --- # 30 Amp Power 277V AC Ready 10kA Protection Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip **Brand:** westinghouse **Price:** $44.74 **Availability:** ✅ In Stock ## Summary > ⚙️ Power Up Your Protection! ## Quick Answers - **What is this?** Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip by westinghouse - **How much does it cost?** $44.74 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/512080106-westinghouse-ul-489-ac-miniature-circuit-breaker-30-amp-single) ## Best For - westinghouse enthusiasts ## Why This Product - Trusted westinghouse brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Safety First:** UL489 Certified for ultimate peace of mind. - • **Rapid Response:** Interrupts within the first half AC cycle. - • **Quick Installation:** Easily snaps onto 35mm DIN Rails. - • **Reliable Performance:** Designed for both AC and DC circuits. - • **Versatile Applications:** Perfect for HVAC, PLCs, and more. ## Overview The Westinghouse UL 489 AC Miniature Circuit Breaker is a robust 30 Amp, single pole device designed for superior thermal overload and short circuit protection. With a C Curve rating and a 10kA interrupting capacity, it meets stringent UL489 standards, making it ideal for various applications including HVAC systems and motor control circuits. This non-polarized breaker is easy to install on DIN rails and is UL Listed for safety in both the US and Canada. ## Description Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip ## Features - UL489 Certified: Meets National Electrical Code standards to serve as primary thermal overload and short circuit protection. Approved by Underwriters Laboratories for Branch Circuit protection in US and Canada. UL File: E517976 - Standard Installation: Mini Circuit Breaker snaps on 35mm DIN Rails or may be directly mounted to control panels. Typically used in motor control circuits, HVAC / HVACR Equipment, input output module protection for programmable logical controllers (PLC) and distributed control systems (DCS), relays and instrumentation among other applications. - Specifications: 30 Amp 1 pole C Trip Curve MCB rated for 10kAIC 277V AC. Direct current rating is 60V DC. Westinghouse Model Number: WMBB1C30 - Current Limiting: Westinghouse MCBs are designed to interrupt within the first half AC cycle compared to 1 to 2 AC cycles for conventional breakers - What’s Included: Single Pole Miniature Circuit Breaker only. DIN Rail and Installation Kit sold separately ## Images ![Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip - Image 1](https://m.media-amazon.com/images/I/61XuNScGK2L.jpg) ![Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip - Image 2](https://m.media-amazon.com/images/I/615R9WvmamL.jpg) ![Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip - Image 3](https://m.media-amazon.com/images/I/812jz02NJ4L.jpg) ![Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip - Image 4](https://m.media-amazon.com/images/I/71nN+uEtNqL.jpg) ![Westinghouse UL 489 AC Miniature Circuit Breaker, 30 Amp, Single Pole, C Curve, 10kA, 277V AC, 60V DC, Non-Polarized, UL Listed, DIN Rail Breaker with Thermal Magnetic Trip - Image 5](https://m.media-amazon.com/images/I/81+oIMiAgIL.jpg) ## Available Options This product comes in different **Material Type, Style** options. ## Questions & Answers **Q: Why does this circuit breaker have extensions on the side? Many others do not have this design.** A: Westinghouse Miniature Circuit Breakers are certified UL-489 which means suitable for branch circuit protection. The extended barriers are necessary for UL-489 approval. Other MCBs without the extended barriers are either NOT UL certified, or only UL approved as supplementary protectors meaning the MCB must be used with a fully rated breaker within the same panel. Applying Westinghouse MCBs will assure that your installation is utilizing fully UL approved breakers. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars A compact solution to my emergency-generator-to-house interface needs. *by J***Z on Reviewed in the United States on January 1, 2023* These seemingly well-made Westinghouse mini-breakers provide a compact solution to my need to safely interface a 3.5 kW emergency generator with four electrically-independent switch-plus-GFCI outlets in my basement. I particularly appreciate the dual-connection terminals on each end, which have allowed me to power two current monitors, as well as connect primary 15 amp loads, and still meet code. See the wiring photo.However, upon installing these Westinghouse mini-breakers for the first time on my breaker box’s din rail, I couldn’t help noticing that only three of these breakers will fit, as is apparent in a second photo. (The box manufacturer claims room for four mini-breakers.) The positioning of plastic posts in the box prevents these particular breakers from occupying the extremes of the din rail, as shown in the third photo. No issue for me, given that I only need two breakers. Moreover, I find no fault with Westinghouse in that regard. I fault the manufacturer of the somewhat-cramped LeMotech breaker box (which I’ve reviewed separately on Amazon), so I’ll not deduct a rating star for that reason.I have not tested — and probably cannot accurately test — the C-curve trip points of these UL-rated and CE-rated breakers. Therefore, I cannot comment on their primary functionality. However, if I discover functional problems during use I’ll likely revisit and down-rate this review. For now, however, I can’t justifiably deduct stars. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars very good *by 1***W on Reviewed in the United States on November 3, 2022* Item high-standard. Notably swift dispatch. The packaging was notably pretty. Would buy from again. Immensely pleased. A+ ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Good mini *by R***D on Reviewed in the United States on May 15, 2023* I tried this and then purchased some additional ones because of the small form factor to use as a sub panel for my grow tents and workshop. Easy to wire, good motion and action. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/512080106-westinghouse-ul-489-ac-miniature-circuit-breaker-30-amp-single](https://www.desertcart.us/products/512080106-westinghouse-ul-489-ac-miniature-circuit-breaker-30-amp-single) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*