--- product_id: 312329391 title: "Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm" brand: "master lock" price: "€ 44.66" currency: EUR in_stock: true reviews_count: 5 category: "Master Lock" url: https://www.desertcart.be/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout store_origin: BE region: Belgium --- # Fits hi-voltage breakers Universal padlock compatibility Durable powder-coated steel Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm **Brand:** master lock **Price:** € 44.66 **Availability:** ✅ In Stock ## Summary > 🔐 Lock it down, power up safety — the pro’s choice for breaker lockout! ## Quick Answers - **What is this?** Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm by master lock - **How much does it cost?** € 44.66 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout) ## Best For - master lock enthusiasts ## Why This Product - Trusted master lock brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built for Extremes:** Zenex composite body resists chemicals & temps from -57°C to 182°C. - • **Compact Powerhouse:** Slim, lightweight design fits easily in your toolkit or pocket. - • **Rugged Reliability:** Hardened steel and reinforced polymer ensure long-lasting performance in harsh environments. - • **Secure Grip, Zero Slip:** Patented thumb-turn clamp locks breakers tight for ultimate safety. - • **Universal Lock Compatibility:** Works seamlessly with all American & Master Lock padlocks and lockout hasps. ## Overview The Master Lock 491B Grip Tight Circuit Breaker Lockout is a compact, durable device designed to securely lock out wide or tall hi-voltage circuit breakers. Featuring a patented thumb-turn clamp, it ensures a tight grip on toggles and accepts all major safety padlocks. Built with powder-coated steel and Zenex composite, it withstands extreme temperatures and harsh conditions, making it an essential safety tool for professionals. ## Description Product Description The Master Lock No. 491B Grip Tight Circuit Breaker Lockout Device fits wide or tall breaker toggles typically found on hi-voltage/hi-amperage breakers. The innovative patented Grip Tight design effectively locks out circuit breakers with a simple thumb turn and then close clamping handle for a tight grip on the toggle. Device accepts all American Lock® and Master Lock® safety padlocks and most lockout hasps for full lockout. Durable construction stands up in harsh environments and compact design is easy to carry and store. Set Contains: 1 x Master Lock Lockout Circuit Breaker Small Review: Muy buen producto para el trabajo Review: Commande reçu à temps et quantité exact contrairement à d’autre. Top top ## Features - Fits wide or tall breaker toggles typically found on hi-voltage/hi-amperage breakers - Adjust to breaker with simple thumb turn and then close clamping handle for a tight grip on the toggle - Durable construction with powder coated steel and reinforced polymer for operation in harsh environments - Compact lockout device is easy to carry and easy to store - Accepts all American Lock and Master Lock safety padlock shackles and lockout hasp diameters.Zenex composite body, which withstands chemicals and extreme temperatures ranging from -57 to 182.have a secure and simple mounting for a solid lock out..body is made from hardened steel. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004J173HY | | Best Sellers Rank | #87,153 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #194 in Keyed Padlocks | | Brand | Master Lock | | Color | Red | | Customer Reviews | 4.7 4.7 out of 5 stars (496) | | Date First Available | 1 May 2014 | | Item Weight | 45.4 g | | Material | Steel | | Model Number | 491B | | Product Dimensions | 10.16 x 5.08 x 2.54 cm; 45.36 g | | Voltage | 120 Volts | ## Product Details - **Brand:** Master Lock - **Circuit breaker type:** Standard - **Current rating:** 2 Amps - **Mounting type:** Snap-In Mount - **Product dimensions:** 51D x 25W x 25H millimeters ## Images ![Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm - Image 1](https://m.media-amazon.com/images/I/61GT6MscUTL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by E***. on 4 June 2025* Muy buen producto para el trabajo ### ⭐⭐⭐⭐⭐ Review *by H***F on 1 September 2024* Commande reçu à temps et quantité exact contrairement à d’autre. Top top ### ⭐⭐⭐⭐⭐ Review *by R***R on 19 December 2019* Worked perfectly for my job. Allowed me to lock out 575v circuit breaker without problems ## Frequently Bought Together - Master Lock 491B Lockout Tagout Circuit Breaker Lockout, Tall and Wide Toggles, Red - Master Lock Red Lockout Tagout Safety Padlock with Key, Metal Shackle and Non-Conductive Lock Body for Electrical Applications, 410RED - Master Lock Safety Series 1' Jaw Steel Lockout Hasp --- ## 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.be/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout](https://www.desertcart.be/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-04-22*