--- product_id: 49108896 title: "MK Electric Sentry 20A Single Pole Type B MCB" brand: "mk" price: "FREE" currency: GBP in_stock: false reviews_count: 7 url: https://www.desertcart.co.uk/products/49108896-mk-electric-sentry-20a-single-pole-type-b-mcb store_origin: GB region: United Kingdom --- # 20A high current capacity 35mm² tunnel terminals Thermo-magnetic dual protection MK Electric Sentry 20A Single Pole Type B MCB **Brand:** mk **Price:** FREE **Availability:** ❌ Out of Stock ## Summary > ⚡ Power up your safety game with MK Electric Sentry! ## Quick Answers - **What is this?** MK Electric Sentry 20A Single Pole Type B MCB by mk - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/49108896-mk-electric-sentry-20a-single-pole-type-b-mcb) ## Best For - mk enthusiasts ## Why This Product - Trusted mk brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact DIN Rail Mount Design:** Space-saving 1.8 x 7.4 x 8.3 cm footprint fits effortlessly into modern electrical panels. - • **Robust 35mm² Tunnel Terminals:** Supports heavy-duty wiring for seamless, professional-grade installations. - • **Secure Lockable Operating Dolly:** Lock the switch On or Off without compromising trip functionality—ultimate control and safety. - • **Reliable 20A Overcurrent Defense:** Engineered to instantly detect and interrupt overloads, safeguarding your electrical setup. - • **Dual Thermal & Magnetic Protection:** Combines heat and magnetic sensors for precise, fail-safe circuit breaking. ## Overview The MK Electric Sentry 20A Single Pole Type B MCB by Honeywell is a compact, thermo-magnetic miniature circuit breaker designed for reliable overcurrent protection. Featuring a 20A rating, lockable operating dolly, and robust 35mm² tunnel terminals, it ensures professional-grade safety and easy installation on DIN rails. ## Description Sentry 20A single pole 230V one module miniature circuit breaker is of the thermo-magnetic, current limiting type and are available with Type B operating characteristics. It has been carefully designed and engineered using thermal and magnetic elements to detect overcurrent's due to both overload and fault currents. It will operate and interrupt the supply to prevent damage to the installation. The thermal component is a carefully calibrated, thermally operated bi-metal element. The operating dolly may be locked in either the On or Off position without affecting the ability of the trip mechanism to operate. The contacts themselves are manufactured from carefully chosen materials, selected specifically for their low electrical resistance and low propensity to weld under fault conditions. When the green indicator is visible, then a contact gap of 4 mm has been achieved. It may be used as single pole isolating switches where appropriate. Features tunnel terminals of 35mm² capacity on all ratings. Each terminal has a protective shutter to prevent cable being installed incorrectly. The terminal screws are touch proof to IP2X, captive and feature combination heads. Type B has magnetic operating limits are between 3 and 5 times the current rating of the MCB. Under these conditions the mechanism of a 10A MCB will operate between 30A and 50A in an overcurrent situation. Review: What you expect from MK - Cost a little more, but fits and works as expected. Well worth the money Review: Good stuff - MCB was good and service was spot on. ## Features - Thermo-magnetic 20A single pole 230V type B miniature circuit breaker - Designed and engineered using thermal and magnetic elements to detect overcurrents - Operate and interrupt the supply to prevent damage to the installation - Features tunnel terminals of 35mm² capacity on all ratings - Operating dolly may be locked in either the On or Off position without affecting the ability of the trip mechanism ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00NGSRL82 | | Best Sellers Rank | 398,297 in DIY & Tools ( See Top 100 in DIY & Tools ) 830 in Circuit Breakers | | Brand | MK | | Circuit Breaker Type | Standard | | Circuit breaker type | Standard | | Current Rating | 20 Amps | | Current rating | 20 Amps | | Customer Reviews | 4.2 out of 5 stars 36 Reviews | | Included Components | 1 x MK Electric Sentry 20A Single Pole Type B MCB | | Item Type Name | Type B MCB | | Manufacturer | Honeywell | | Manufacturer Part Number | 5920S | | Model Number | 5920S | | Mounting Type | DIN Rail Mount | | Mounting type | DIN Rail Mount | | Number of Poles | 1 | | Number of poles | 1 | | Product Warranty | 10 year guarantee. | ## Product Details - **Brand:** MK - **Current rating:** 20 Amps - **Circuit breaker type:** Standard - **Mounting type:** DIN Rail Mount - **Number of poles:** 1 ## Images ![MK Electric Sentry 20A Single Pole Type B MCB - Image 1](https://m.media-amazon.com/images/I/8112HvT9GbL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ What you expect from MK *by D***E on 8 January 2023* Cost a little more, but fits and works as expected. Well worth the money ### ⭐⭐⭐⭐⭐ Good stuff *by D***N on 15 April 2025* MCB was good and service was spot on. ### ⭐⭐⭐⭐⭐ Great profuct *by D***N on 25 April 2023* Very good price for quality product ## Frequently Bought Together - MK Electric Sentry 20A Single Pole Type B MCB - MK Electric Sentry 32A Single Pole Type B MCB - MK Sentry 5940s - 40a Type B Single Pole MCB --- ## 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.co.uk/products/49108896-mk-electric-sentry-20a-single-pole-type-b-mcb](https://www.desertcart.co.uk/products/49108896-mk-electric-sentry-20a-single-pole-type-b-mcb) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-24*