ou're specifying a contactor for an electric forklift, a battery-powered vehicle, or an industrial winch. The application requires not just switching high current, but reversing the motor direction—forward and reverse—reliably, hundreds of thousands of times. A ZJWT Series DC Contactor is purpose-built for exactly this job. It's a reversing contactor with a set of commutation contacts, designed to handle the demanding switching requirements of battery-powered equipment. This guide covers the key specifications, construction features, and selection criteria—so you can evaluate whether the ZJWT series is the right choice for your high-current DC switching application.
What a Reversing Contactor Does – And Why It's Different
A reversing DC contactor is a specialized switching device that controls the direction of a DC motor. It contains a set of commutation contacts that allow the polarity of the voltage applied to the motor to be reversed, changing the direction of rotation. The ZJWT Series is built with a set of commutation contacts, making it suitable for applications where motor direction needs to be controlled—forward and reverse—from a single contactor. Unlike a standard single-pole contactor that simply opens or closes a circuit, a reversing contactor manages both the connection and the polarity reversal, simplifying the control circuitry and reducing component count.
Commutation Contacts vs. Standard Contacts
The commutation contacts in the ZJWT Series enable the contactor to reverse the polarity of the DC supply to the motor. The ZJWT200 features a set of commutation contacts that provide both the main power switching and the reversing function in a single, integrated package.
Double Coil Design for Reliable Reversing
The ZJWT Series uses a double coil double (reversing) design. This configuration ensures that the contactor can reliably switch between forward and reverse states without the risk of contact overlap or short circuits. The double coil design also provides faster response times and more consistent operation across the contactor's life.
Current and Voltage Ratings – Matching the Contactor to Your Load
The electrical ratings determine whether a contactor can handle your application's power requirements. The ZJWT200 is rated for a rated current of 200A and a rated voltage of ≤48V DC for the main contacts. The instantaneous maximum (closing) current is 7 times the rated current (7Ie) for ≤1 second. The contact voltage drop is ≤80mV at 100A.
Rated Current and Voltage
The 200A continuous current rating and 48V DC voltage rating make the ZJWT200 suitable for a wide range of battery-powered equipment. The contactor's ability to handle 7 times the rated current for short periods is critical for motor starting, where inrush currents can be several times the running current.
Contact Voltage Drop and Power Loss
The ≤80mV voltage drop at 100A ensures low power loss and minimal heat generation at the contact interface. This is particularly important in battery-powered applications where every watt of lost power reduces operating time.
Coil Options – Matching the Control Voltage to Your System
The ZJWT Series is available with multiple coil voltage options, giving you flexibility to match the contactor to your control system. Available coil voltages include 12V, 24V, 48V, and 72V. The coil DC power consumption is ≤10W for long-term operation and ≤28W for short-term operation.
Pickup and Release Voltage
The pickup voltage is ≤75% of the rated voltage (Us) , and the release voltage is ≥5% Us and ≤40% Us. This ensures reliable operation even when the battery voltage fluctuates—a common condition in battery-powered equipment.
Coil Resistance Values
The coil resistance values vary by voltage: 12V coil has a long-term resistance of 14.4Ω and short-term of 5.3Ω; 24V coil has 57.6Ω long-term and 21.3Ω short-term; 48V coil has 230.4Ω long-term and 85.3Ω short-term.
Environmental and Mechanical Specifications
The ZJWT Series is designed for demanding operating conditions. The working temperature range is -25°C to +55°C. The contactor offers a protection grade of IP67, providing protection against dust ingress and temporary immersion in water.
Vibration and Shock Resistance
The contactor is rated for vibration: 2.5g, (5-50) Hz and impact: 50g, 11ms (half sine). This makes it suitable for mobile equipment subject to rough operating conditions—forklifts, excavators, and electric vehicles.
Mechanical and Electrical Life
The ZJWT200 offers a mechanical life of ≥300,000 operations and an electrical life of ≥20,000 operations. The long mechanical life ensures the contactor can handle the frequent switching demands of battery-powered equipment.
Key Technical Specifications
| Specification | ZJWT200 Value | Why It Matters |
|---|---|---|
| Contact type | Set of commutation contacts | Reversing capability for motor control |
| Rated voltage (DC) | ≤48V | Matches battery system voltage |
| Rated current | 200A | Continuous current capacity |
| Instantaneous max. current | 7Ie, ≤1s | Handles motor inrush currents |
| Contact voltage drop | ≤80mV at 100A | Low power loss, efficient operation |
| Coil voltages | 12V, 24V, 48V, 72V | Control system compatibility |
| Coil power consumption | ≤10W / ≤28W | Long-term and short-term ratings |
| Insulation resistance | ≥100MΩ | Electrical safety |
| Dielectric withstand | 1500V, 1min | Insulation integrity |
| Protection grade | IP67 | Dust-tight and water immersion resistant |
| Working temperature | -25°C to +55°C | Operating environment range |
| Vibration | 2.5g, (5-50)Hz | Resistance to mechanical vibration |
| Impact | 50g, 11ms | Shock resistance |
| Mechanical life | ≥300,000 operations | Long-term durability |
| Electrical life | ≥20,000 operations | Switching endurance |
Applications – Where ZJWT Contactors Are Used
ZJWT Series DC contactors are found across a range of battery-powered and industrial applications where high-current DC switching and motor reversing are required.
Electric Forklifts and Material Handling
Electric forklifts, pallet trucks, and other material handling equipment use ZJWT contactors for traction motor control. The ability to handle 200A continuous current and reverse motor direction makes these contactors ideal for driving and maneuvering battery-powered lift trucks.
Electric Vehicles and Battery Cars
Electric vehicles (EVs), battery cars, and golf carts use these contactors for motor control and battery disconnect. The IP67 protection rating and wide temperature range make them suitable for outdoor and mobile applications.
Electric Winches and Excavators
Winches and excavators require high-current switching under heavy loads and demanding conditions. The ZJWT Series contactors provide the durability and reliability needed for these severe-duty applications.
Communication Equipment and UPS Systems
The ZJWT Series is also used in telecommunication base stations and UPS power supplies, where the contacts can also be used for AC loads at 380V, 220V, and 110V.
What Engineers Ask About Reversing DC Contactors
What is a reversing DC contactor?
A reversing DC contactor is a specialized switching device with commutation contacts that allow the polarity of the DC supply to a motor to be reversed, controlling the direction of rotation. It combines the switching and reversing functions in a single integrated package.
What is the current rating of the ZJWT200?
The ZJWT200 is rated for 200A continuous current at ≤48V DC, with an instantaneous maximum current of 7 times the rated current for ≤1 second.
What coil voltages are available?
The ZJWT Series is available with coil voltages including 12V, 24V, 48V, and 72V.
What is the protection rating?
The ZJWT Series offers IP67 protection against dust ingress and temporary immersion in water.
What is the typical operating temperature range?
The contactor operates from -25°C to +55°C.
Need a Reversing Contactor That Handles the Load? Let's Find the Right Fit
Selecting a ZJWT Series DC contactor comes down to three factors: current rating (match your motor load), coil voltage (match your control system), and protection rating (match your environment). Contact Nanfeng Electric for technical support and samples → —their team can help you select the right ZJWT200 configuration for your specific reversing application.
Nanfeng Electric specializes in the development and manufacturing of DC contactors for battery-powered equipment. The ZJWT200 DC Contactor features a set of commutation contacts for motor reversing, rated current of 200A, rated voltage of ≤48V DC, and coil voltage options including 12V, 24V, 48V, and 72V. It offers IP67 protection, vibration resistance of 2.5g, and impact resistance of 50g. Applications include electric forklifts, battery cars, electric winches, excavators, telecommunication equipment, and UPS systems. Connect with Nanfeng Electric to discuss your current requirements, coil voltage specifications, and application conditions.
