DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
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DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
DPDT DC Contactor for Heavy Duty Applications
SEV50ADXL 50A 5-1000V Coil 12V-72V High Voltage DC Contactor
SEV50ADXL 50A 5-1000V Coil 12V-72V High Voltage DC Contactor
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SW400 400A SPST NO DC Contactor
SW400 400A SPST NO DC Contactor

DPDT DC Contactor for Heavy Duty Applications

Brand Name:Newtrend or OEM
Place of Origin:China
Model Number:SW series
SKU: 1770410483015229440 Category:
Description

DC Contactor 2NO 2NC 3NO 3NC 4NO 4NC 50A 100A 200A 12Vdc 24Vdc 48Vdc 72Vdc 110Vdc 220Vdc DPDT DC Contactor

 

The SW series has been designed for direct current DC loads, including motors as used on Electric vehicles, Telecom PDU’s, Battery Chargers, EV’s, Static power systems, Industrial trucks, Marine winches, power distribution applications. 

 

Specifications (2NO, 2NC, 2NO+2NC DC Contactors):

Model SW50-20 SW100-20 SW200-20 SW50-02 SW100-02 SW200-02 SW50-22 SW100-22 SW200-22
Photo            
Rated Current (DC) 50A 100A 200A 50A 100A 200A 50A 100A 200A
Rated Current (AC) 10A 30A 60A 10A 30A 60A 10A 30A 60A
Contact Form 2NO 2NC   2NO+2NC
Contact Circuit Voltage ≤48VDC, ≤380VAC
Coil Voltage 12VDC, 24VDC, 48VDC, 72VDC, 110VDC, 220VDC etc
Dielectric Voltage Strength 50Hz 1000V AC 1min
Volt Drop of Main Contact <80mV
Typical Pull-In Time <30ms
Typical Drop-Out Time <50ms
Pull-In Voltage <70%Us
Drop-Out Voltage 5% – 40%
Mechanical life 100 thousand times
Electric life 20 thousand times
Wiring Diagram    

 

Specifications (3NO, 3NC, 3NO+3NC, 4NO DC Contactors):

Model SW100-30 SW200-30 SW100-03 SW200-03 SW100-33 SW200-33 SW100-40 SW200-40
Photo
Rated Current (DC) 100A 200A 100A 200A 100A 200A 100A 200A
Rated Current (AC) 30A 60A 30A 60A 30A 60A 30A 60A
Contact Form 3NO 3NC 3NO+3NC 4NO 
Contact Circuit Voltage ≤48VDC, ≤380VAC
Coil Voltage 12VDC, 24VDC, 48VDC, 72VDC, 110VDC, 220VDC etc
Dielectric Voltage Strength 50Hz 1000V AC 1min
Volt Drop of Main Contact <80mV
Typical Pull-In Time <30ms
Typical Drop-Out Time <50ms
Pull-In Voltage <70%Us
Drop-Out Voltage 5% – 40%
Mechanical life 100 thousand times
Electric life 20 thousand times
Wiring Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for DPDT DC Contactor for Heavy Duty Applications.

📥
Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.
Request Official Datasheet (PDF)
📐
2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.
Request CAD Model
Certified Standards: IEC 60898-1, IEC 60947-2, CE, RoHS, ISO 9001:2015
Manufacturer: Shanghai Newtrend Electric Co., Ltd. (Global Export Compliance)
Engineering Support: 24-hour response for custom voltage ratings, auxiliary contacts, and technical consulting.
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)?

A

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?

A

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?

A

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?

A

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?

A

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.

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