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Dongfeng High-quality Heavy-duty Truck Auto Parts Power Switch 3736010-TL770

The Battery Master Switch (Part No. 3736010-TL770) is an OEM-specified manual mechanical power disconnect switch designed for use in Dongfeng commercial vehicles and select SHACMAN DeLong heavy-duty trucks. This critical safety component allows drivers or technicians to physically isolate the vehicle’s battery from the entire electrical system during long-term parking, maintenance, or emergency situations.

Unlike electromagnetic remote switches, this unit operates via a rotary handle mechanism, providing true physical disconnection of high-current circuits without reliance on electronic components. It plays a vital role in preventing battery drain, parasitic leakage, and potential electrical fires—especially in modern trucks equipped with complex electronics, telematics, and urea dosing systems that consume power even when off.
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  • 3736010-TL770

  • Dongfeng

Attribute Specification
Product Name Manual Battery Master Switch / Power Isolation Switch
Manufacturer Dongfeng Commercial Vehicles Co., Ltd. (OEM)
Primary Part Number 3736010-TL770
Alternative Names Battery Disconnect Switch, Manual Power Cut-Off, Red Knob Switch
Voltage Rating 24V DC (compatible with 12–32V systems)
Control Type Manual rotary handle (mechanical contact separation)
Mounting Style Bolt-on chassis or battery box bracket
Switch Location Typically installed on negative or positive battery terminal
Housing Material Flame-retardant engineering plastic (UL94-V0 rated)
Conductive Components High-conductivity tinned copper posts with anti-loosening nuts
Sealing Level IP54-rated (dust protected and splash-water resistant)
Application Class Heavy-Duty Trucks, Construction Equipment, Special Purpose Vehicles
电源开关-3


电源开关-2


Parameter Value / Detail
Rated Continuous Current 150A – 250A
Peak Surge Current Up to 1,000A – 2,000A (for 5–10 seconds during engine cranking)
Operating Voltage 24V DC nominal (suitable for all 24V truck systems)
Switch Mechanism Rotary cam-type manual actuator
Contact Resistance < 0.5 mΩ (ensures minimal voltage drop and heat generation)
Dielectric Strength Withstands > 1,500V AC between housing and terminals
Operating Temperature Range -40°C to +85°C (-40°F to +185°F)
Vibration Resistance Complies with QC/T 413 and GB/T 28046 standards
Weight Approx. 0.8 – 1.1 kg
Installation Hole Pattern Standardized mounting holes (M6/M8) for universal fitment


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