SZJ400A-D MZJ-400D ZJ400D Mini Orange DC Contactor 400A

Name: SZJ400A-D MZJ-400D ZJ400D Mini Orange DC Contactor 400A
Brand: NewTrend or OEM
SKU: 1600766385091

Electricity Type:DC
Brand Name:NewTrend or OEM
Place of Origin:China
Model Number:ZJ400D
Phase:1
Main Circuit Rating Current:400A

Number of Pole

Main Circuit Rating Voltage

SKU: 1600766385091 Category: Others

Description

ZJ400D 400A SPST NO Normal Open 12V 24V 36V 48V 72V 80V Solenoid Relay DC Contactor for Electric Vehicle Forklift Golf Cart

The ZJ400D contactor is a SPST (Single Pole Single Throw; Normally Open type) DC contactor, designed for direct current loads, particularly for motors on small electric vehicles such as light industrial trucks, electric forklift, electric pallet stacker, golf cart, etc. ZJ400D has double breaking main contacts with silver alloy contact tips, which are weld resistant, hard wearing and have excellent conductivity.

Specifications:

Model: ZJ400D
Voltage Options (Volts): 12V, 24V, 36V, 48V or 72V.
Ambient temperature:-25~+40℃
Altitude range:0~2000m
Max.relative humidity: 90% at 25℃
Installation method:vetically or horizontally
Voltage fluctuating:0.7~1.1Ue

Main rated load current of contact circuit (amps): 400A
Dielectric (volt) strength: 50Hz 1000V AC 1min
Current volt drop of main contact at 200A: Not above 80mV
Dimensions (LxWxH ): 104.5x65x106 mm
Mounting: two 6mm fixing holes in bracket;

pitch-row: 63mm
Continual working duration: 8h
Mechanical life: 100,000 times
Electric life: 2,000,000 times

Additional information

Weight	2 kg
Dimensions	25 × 25 × 25 cm
Number of Pole	1
Main Circuit Rating Voltage	12V 24V 36V 48V 72V 80V DC

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for SZJ400A-D MZJ-400D ZJ400D Mini Orange DC Contactor 400A.

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Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.

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2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.

Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

AC-1 / AC-3 Duty

How to calculate contactor rating based on motor power and utilization categories (AC-1 vs AC-3 vs AC-4)?

AC-3 rating applies to standard squirrel-cage motor starting and stopping during normal run (starting current 5–7x In). For non-inductive or purely resistive heating loads, use the higher AC-1 rating. For severe inching, jogging, and plugging applications (AC-4 duty), derate the contactor or upsize by 1 to 2 frame sizes to prevent contact erosion.

Coil Voltage Selection

How to choose the correct control coil voltage, frequency, and electronic wide-voltage options?

Standard AC coils include 24V, 48V, 110V, 220V/230V, 380V at 50/60Hz. For DC control loops or PLC outputs, specify DC coils or electronic wide-range AC/DC coils (e.g. 100V–250V AC/DC) which feature built-in surge suppression, low holding power consumption, and immunity to voltage dips.

Overload Coordination

How to size and coordinate the matching thermal overload relay (TOR) for Type 2 protection?

Select a thermal overload relay whose current setting range straddles the motor full-load current (FLA). Set the dial precisely to 1.0x motor nameplate FLA. For IEC 60947-4-1 Type 2 coordination, pair the contactor and relay with backed-up upstream fuses or fast-acting MCB/MCCB to prevent welding under fault conditions.

Auxiliary & Interlocks

What auxiliary contact blocks and mechanical interlocks can be added for motor reversing?

Units feature built-in 1NO or 1NC auxiliary contacts, expandable with top-mounted 2-pole or 4-pole auxiliary contact blocks (F4 / AX) and pneumatic timer delay blocks. For forward/reverse motor starters or star-delta starter assemblies, add side-mounted mechanical interlock units (MI) with electrical interlocking.

Ambient & Altitude Derating

How do ambient temperature and installation altitude affect contactor performance?

Standard ratings are calibrated for -5°C to +40°C. For ambient temperatures exceeding 55°C or altitudes above 2000m (where reduced air density diminishes heat dissipation and dielectric insulation), derate operational current by 2% per 100m above 2000m and verify insulation voltage limits per IEC standards.