--- product_id: 210157374 title: "Lider Single Phase Preventer + Autoswitch [L- ASDOL ]" brand: "lider" price: "£6.79" currency: GBP in_stock: true reviews_count: 7 url: https://www.desertcart.co.uk/products/210157374-lider-single-phase-preventer-autoswitch-l-asdol store_origin: GB region: Great Britain --- # High/Low Voltage Tripping Auto Restart Feature Solid State PCB Protection Lider Single Phase Preventer + Autoswitch [L- ASDOL ] **Brand:** lider **Price:** £6.79 **Availability:** ✅ In Stock ## Summary > 🔋 Power Up Your Peace of Mind! ## Quick Answers - **What is this?** Lider Single Phase Preventer + Autoswitch [L- ASDOL ] by lider - **How much does it cost?** £6.79 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/210157374-lider-single-phase-preventer-autoswitch-l-asdol) ## Best For - lider enthusiasts ## Why This Product - Trusted lider brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **⏳ Smart Delay:** 30-second ON delay ensures safe equipment restart. - • **📏 Compact Size:** Lightweight and space-efficient at just 510g. - • **💡 LED Indicators:** Clear visual alerts for healthy voltage and fault conditions. - • **🔧 Durable Design:** Constructed with robust plastic for long-lasting performance. - • **🔌 Reliable Protection:** Safeguards 3-phase equipment from overloads and phase failures. ## Overview The LIDER Single Phase Preventer with Auto Restart (L-ASDOL) is an essential device for protecting 3-phase equipment from overloads, phase failures, and unbalanced voltage supply. Featuring a solid state PCB, it ensures reliable operation with a 30-second delay for safe restarts, complemented by LED indicators for real-time monitoring. ## Description ■ Lider Single Phase Preventer with Auto Restart [AUTO SWITCH] gives protection against single phasing, reverse phasing or unbalance voltage supply along with HIGH/LOW voltage tripping to ensure trouble free running of 3 Phase equipment and it also auto starts the equipment with ON DELAY time of 30 secs. SINGLE PHASE PREVENTOR +AUTOSWITCH TECHNICAL DETAILS ■Principle of Operation►Voltage Sensing. ■Supply/ Monitoring Voltage(V)► 3 Phase, 415 VAC, 50Hz ■Relay Output ►One Change Over (1 NO) ► 5 amps@ 230 VAC/ 28 VDC resistive load ■Voltage Unbalance trip setting►40 V ± 6 V. ■Minimum delay between OFF & ON auto mode - 30 secs ±5secs. ■Trip Time delay► 2 to 3 secs for phase reversal & phase unbalance, ►<1 sec. for single phasing. ■Enclosure-ABS Electrical Grade Plastic Molded. ■Mounting-Panel mounting /Screw type. ■Connection diagram provided. ■Quality control - Govt. C.P.R.I. Bhopal Tested and Certified. ■Warranty-One Year against any manufacturing defect. ADVANTAGES ■Small device, Easy to install, Solid state PCB with Transformer. ■Automatically starts the motor, no need of operator. ■Prevents equipments from Single Phasing, ■Reverse Phasing and Unbalance Supply. ■No Separate Auxiliary Supply Required. ■Auto Resetting Mode available. ■Auto manual switch provided for bypass condition (optional). ■Horsepower(HP)- suitable for any HP rating pumps. ■Pre wired terminals for easy connection. ■Product directly going from Manufacturer to Customers. APPLICATION Our Products are ideally suitable for all Three Phase Equipments-Electrical Panels, Compressor motors, Electrical Test benches, Submersible pumps, Genset panels, Cold storages, Hoist Motor Controls, Valve Actuators, Motors Machine Tools, Injection Molding Machines, Packaging units, Central Air Conditioning Plants etc. LIDER BRAND is a registered TRADEMARK of the company LIDER ELECTRIC in specified product and brand registry by desertcart. Legal action can be taken if any seller is selling product in brand name LIDER. Review: Very good product. - This is very good product.can use for agriculture water pump Review: Not good ☺️ - Performance not properly ## Features - For safe running of 3-phase equipments, special protection devices are required to keep a continuous watch on supply conditions. - The major cause of maximum 3-phase equipments burn-out is overloading which occurs due to unbalance supply or single phasing. Phase failure occurs in case of loose connections, fuse blown-off or loss of phase from supply itself. Protection to 3 phase equipments against single phasing, reverse phasing or unbalance voltage supply is one of the major problems in electrical systems. - Our LIDER Single Phase Preventer with Auto Restart (AUTO SWITCH) built in with solid state PCB with transformer gives these protections along with HIGH/LOW voltage tripping to ensure trouble free running of 3 Phase equipments and it auto starts the equipment with ON DELAY time of 30 secs. - Single Phase Preventer with Auto Restart (AUTO SWITCH) gives ON indication by LED after DELAY time of 30 secs under healthy voltage conditions and gives OFF indication by LED during phase failure, reverse phasing or phase unbalance. [Please see full PRODUCT DESCRIPTION below] ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07ML5YVT9 | | Brand | LIDER | | Customer Reviews | 3.6 3.6 out of 5 stars (21) | | Date First Available | 17 August 2019 | | Item Weight | 510 g | | Item part number | L-ASDOL | | Manufacturer | LIDER ELECTRIC | | Number of Memory Sticks | 1 | | Package Dimensions | 14.3 x 13.6 x 8.7 cm; 510 g | ## Product Details - **Brand:** LIDER - **Grit Type:** Coarse - **Manufacturer:** LIDER ELECTRIC - **Material:** Plastic - **Number of Items:** 1 ## Images ![Lider Single Phase Preventer + Autoswitch [L- ASDOL ] - Image 1](https://m.media-amazon.com/images/I/415-D1FIBGL.jpg) ![Lider Single Phase Preventer + Autoswitch [L- ASDOL ] - Image 2](https://m.media-amazon.com/images/I/61UrCcqNx7L.jpg) ![Lider Single Phase Preventer + Autoswitch [L- ASDOL ] - Image 3](https://m.media-amazon.com/images/I/61RMfGhB8eL.jpg) ![Lider Single Phase Preventer + Autoswitch [L- ASDOL ] - Image 4](https://m.media-amazon.com/images/I/61qrG+5ujOL.jpg) ![Lider Single Phase Preventer + Autoswitch [L- ASDOL ] - Image 5](https://m.media-amazon.com/images/I/71BJlBRz1nL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Very good product. *by S***. on 15 March 2021* This is very good product.can use for agriculture water pump ### ⭐ Not good ☺️ *by D***E on 5 July 2022* Performance not properly ### ⭐⭐⭐⭐ Protection switch for 3 phase pump *by R***K on 15 January 2022* Installed on11.01.22. working as expected --- ## 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/210157374-lider-single-phase-preventer-autoswitch-l-asdol](https://www.desertcart.co.uk/products/210157374-lider-single-phase-preventer-autoswitch-l-asdol) --- *Product available on Desertcart Great Britain* *Store origin: GB* *Last updated: 2026-04-23*