I. Core Specifications (24V Model)

Model: ZJ400A (Aliases: MZJ-400A, SZJ400A, AZJ400S)

Coil Voltage: DC 24V (Operating Range: 0.8–1.2 × 24V)

Main Contacts: 1 Set Normally Open (NO), Single-Pole Double-Break

Rated Current: 400A Continuous (Short-term withstand: 7 × 400A for ≤1s)

Contact Voltage: ≤DC 80V (Compatible with 24V/48V systems)

Contact Voltage Drop: ≤80mV @ 100A (Silver Alloy Contacts: AgCuO)

Coil Power Consumption: Approx. 9–12W (Dual-Coil: Pull-in + Hold, Energy-saving)

Operation Time: ≤35ms; Release Time: ≤10ms

Insulation / Dielectric Strength: ≥100MΩ; 1500VAC/1 min

Protection Class: IP50; Ambient Temperature: -25°C to +70°C

Lifespan: Electrical ≥20,000 cycles; Mechanical ≥300,000 cycles

II. Structure and Wiring

Main Circuit: M10 Bolts (Heavy-gauge wiring, 400A); Tightening Torque ≈20.5 N·m

Coil Terminals: M4 Screws (Light-gauge wiring, Control); Torque ≈1.2 N·m

Built-in Features: Polarity Protection Diode + Pre-charge Resistor (47Ω/10W); Protects against reverse polarity and current surges

Mounting: Horizontal (Standard) or Vertical; Vibration-resistant; Suitable for vehicle/marine applications

III. Typical Applications (24V Scenarios)

Construction Machinery: Excavators, Loaders, Forklifts (24V Main Power Master Switch)

Vehicles: Electric Trucks, Tow Tractors, Aerial Work Platforms (Battery Pack / Motor Main Control)

Generator Sets: 24V Battery High-Current Starting / Excitation Control

Marine / RVs: 24V Systems Lithium Battery System, Inverter Main Switch