Battery Master Switch Relay 803645894

Product Introduction

This 803645894 MZJ-400A/006M DC contactor (battery master switch relay) is a heavy-duty high-current main power control component, widely applied to wheel loaders and other construction machinery electrical systems. It is used as the vehicle battery main cut-off switch, responsible for connecting and disconnecting the main power circuit between the battery and machine electrical loads. It prevents static power drain during long-time parking, protects the whole machine electrical system from overload and short-circuit damage.

This DC contactor features a 24V control coil and 48V 400A main contact rating. It adopts high-performance silver alloy contact material, which delivers stable conducting performance and strong arc suppression capability under large current load. The insulation bracket uses high-temperature resistant bakelite material, ensuring excellent insulation performance. The sealed metal body is dust-proof and vibration-resistant, suitable for the severe dusty and vibrating working environment on construction and mining sites. The built-in shock absorption structure effectively avoids loose wiring and contact failure caused by continuous mechanical vibration of loaders.

Produced strictly following OEM specifications, this relay can directly replace original spare parts without modification. We supply OEM equivalent and premium aftermarket quality grades. Every unit undergoes electrical performance, current load and vibration tests before shipment. Export-grade packaging and complete customs documents are available for overseas construction machinery repair shops and equipment distributors.

Key Features

• Part number: 803645894, Model MZJ-400A/006M DC contactor battery master switch relay
• Coil: 24V DC; Main contact: 48V DC, 400A large current rating
• Silver alloy contacts, outstanding arc suppression, stable heavy-current conduction
• High-temperature bakelite insulation frame, reliable insulation performance
• Sealed metal housing, dustproof, anti-vibration, adaptable to harsh construction working conditions
• Standard mounting holes for simple installation, direct replacement without modification
• In stock, factory direct export, mixed container loading available

Why Choose Our 803645894 Battery Master Switch Relay

1. Professional Construction Machinery Electrical Parts Specialization

We specialize in full-range electrical spare parts for wheel loaders and engineering equipment. Our team is familiar with vehicle circuit system parameters and installation requirements, providing accurate part matching and professional technical guidance for machinery overhaul projects.

2. Strict Electrical Performance & Durability Control

All contactors are tested for coil stability, large-current carrying capacity and contact lifetime. We screen out defective products with poor contact or unstable switching, to guarantee safe and reliable main power control for your construction machines.

3. Multiple Quality Grades for Global Market

We offer OEM equivalent and premium aftermarket versions to meet different procurement demands. OEM equivalent products match original electrical performance and dimensions completely. The aftermarket option provides cost-effective replacement for regular fleet maintenance, both with stable quality guarantee.

4. Ready Stock & Fast Shipment

We maintain abundant spot inventory of 803645894 MZJ-400A/006M DC contactors. Products are sorted by part number for quick picking. We support shipment within 3–7 working days and mixed loading with other loader spare parts to cut logistics expenses.

5. Export-Grade Packaging & Full Set Documents

Each contactor is packed with shockproof protection in export cartons to avoid damage during long ocean transport. Our foreign trade team provides complete customs documents including packing list, commercial invoice and inspection certificate for smooth import clearance.

6. Rich Global Export Service Experience

We serve worldwide construction machinery dealers and maintenance teams. We provide pre-sales part verification and responsive after-sales support, solving compatibility problems promptly and establishing long-term stable cooperative relationships.