DC Power Start High current starting preheating relay

Product Overview

The YM W8008-2 is a robust, high-performance starting relay engineered to handle the extreme current demands of heavy-duty applications. Designed for 12V, 24V, 36V, and 48V DC systems, this relay is the critical link between low-current control switches and high-power loads like engine starters, winch motors, and preheating systems. Built to withstand harsh environments in trucks, ships, and industrial vehicles, the W8008-2 ensures reliable power delivery for mission-critical starting operations, making it an indispensable component in any heavy-duty power relay system.

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Technical Specifications

Model: W8008-2 | Coil Voltage Options: DC 12V, 24V, 36V, 48V | Type: Heavy Duty Starting Relay

• Coil Power Consumption: Efficient design, consuming only 0.3W to 0.43W.
• Contact Load Capacity: Engineered for high inrush currents typical of motor starting applications.
• Contact Resistance: Extremely low initial contact resistance (≤50mΩ) to minimize voltage drop and power loss under load.
• Fast Switching Speed: Quick response with action and release times ≤4ms (typically ≤3ms) for immediate engagement.
• Dielectric Strength: High isolation capability: 500V RMS, 50Hz under normal conditions.
• Insulation Resistance: Excellent insulation integrity (>500MΩ) for safe operation in demanding electrical environments.
• Rugged Construction: Sealed to resist moisture and contaminants (leakage rate ≤1x10^-3 Pa·cm³/s).
• Durable Design: Built to last through high-stress starting cycles common in truck and marine applications.

Product Features & Advantages

• Multi-Voltage Compatibility: A single relay platform supports four common DC system voltages (12V, 24V, 36V, 48V), simplifying inventory and design for OEMs serving multiple markets.
• High Inrush Current Handling: Specifically designed as a current starting relay to manage the surge currents from starters, winches, and large motors without welding contacts.
• Heavy-Duty Construction: Features robust terminals, a durable housing, and high-grade internal components to withstand vibration, shock, and temperature extremes.
• Reliable Sealed Housing: Protects against water, dust, salt spray, and oil, making it ideal for under-hood and marine applications.
• Low Power Coil: The efficient coil can be driven directly by standard control switches, ECUs, or smaller control relays without needing a secondary power relay.
• Clear Application Distinction: Unlike general-purpose power relay vs control relay options, the W8008-2 is purpose-built for the high-stress, high-cycle demands of starting duty.

How to Install & Wire This Starting Relay

1. Identify System Voltage: Select the correct W8008-2 variant (12V, 24V, 36V, or 48V) to match your vehicle or equipment's main DC system voltage.
2. Mounting: Securely mount the relay in a location protected from direct water spray and excessive heat, ensuring good airflow. Use appropriate hardware to resist vibration.
3. Wiring Connections:
   • Coil Terminals (85 & 86): Connect to the control circuit (e.g., ignition switch, start button). Observe polarity if specified.
   • High-Current Terminals (30 & 87): Terminal 30 connects directly to the battery (via a fuse). Terminal 87 connects to the high-power load (starter solenoid, winch motor). Use heavy-gauge cables suitable for the current.
4. Protective Components: Always install a properly rated fuse or circuit breaker on the battery feed (Terminal 30). A suppression diode or resistor-capacitor snubber across the coil is recommended to protect the control switch from voltage spikes when relay de-energized.
5. Testing: Before full operation, test the relay function by activating the control circuit. Verify a solid "click" and check for voltage at Terminal 87 when energized.

Application Scenarios

This heavy-duty relay is engineered for the most demanding starting and high-power switching tasks:

• Commercial Trucks & Buses: Primary starting relay for diesel engines, auxiliary power unit (APU) starting, and pneumatic system control.
• Marine & Shipboard Systems: Engine starting, anchor winch control, bow thruster power switching, and high-current bilge pump control.
• Construction & Agricultural Machinery: Starting systems for excavators, tractors, and combines. Also used for hydraulic pump engagement.
• Specialty Vehicles: Starting and power control in emergency vehicles, military vehicles, and airport ground support equipment.
• Industrial Equipment: As a key component in a power distribution relay setup for generator sets, compressor starters, and heavy industrial motor controls.
• DC High Power Start High current starting preheating relay
• W8008-2 12 V 24V 36V 48V for Truck or Ship Application 
• High Current Start Relay W8008-2 for 12V 24V 36V 48V Truck and Ship
• Heavy Duty Starting Relay for 12V 24V 36V 48V Vehicle Use
• Relay with High Starting Current for Ship winch starting relay

Value for B2B Buyers & OEMs

• Enhanced System Reliability: Reduces vehicle/equipment downtime by providing a more reliable alternative to standard relays that fail under starting loads.
• Reduced Warranty Claims: The heavy-duty build and proven design lead to longer service life, decreasing failure-related costs.
• Design Simplification: One relay model covers multiple voltages, streamlining your bill of materials and simplifying the power relay wiring diagram for different product variants.
• Competitive Advantage: Using a component rated for heavier duty than standard relays can be a strong selling point for durability in commercial and industrial markets.

Quality Assurance & Customization

Manufactured under strict IATF-aligned quality controls, each W8008-2 relay is tested for performance and durability. We offer OEM customization, including different terminal types (spade, screw, stud), custom branding, and specific coil resistance values. We can also collaborate on developing variants for emerging new energy commercial vehicles.

FAQ

Q1: What is the main difference between this starting relay and a standard 40A automotive relay?

A1: This is a high power relay switch designed for intermittent, high-inrush current duty (like starting motors). It typically has much larger contacts, heavier internal construction, and is rated for the physical and electrical stress of starting cycles, whereas a standard relay is for continuous lower-current loads like lights or fans.

Q2: Can this relay be used for continuous duty, like powering a light bar?

A2: While capable, it is over-specified for such tasks. For continuous duty, a relay rated for 100% duty cycle at the load current would be more cost-effective. The W8008-2 is optimized for short, high-power bursts.

Q3: Is a diode required on the coil for this relay?

A3: Highly recommended, especially in vehicles with sensitive ECUs. When the coil is de-energized, the collapsing magnetic field creates a high-voltage spike that can damage the control circuit. A diode suppresses this spike—a fundamental principle in electrician u relays and automotive electronics.

Q4: How does it compare to a Solid State Relay (SSR) for this application?

A4: For starting applications, an electromechanical relay like the W8008-2 is generally preferred. It offers much lower contact resistance (less voltage drop), can handle massive inrush currents, and is cost-effective for high-current switching. SSRs can fail short-circuit and generate significant heat at these current levels.

Q5: Do you offer this relay with a mounting bracket or socket?

A5: The standard model is designed for direct screw mounting. However, we can provide custom mounting solutions or refer you to compatible industrial relay sockets as accessories industrial power relay options for specific OEM integration needs.