Product Details

DC motor reversing solid state relays 1A-100A 12V-200VDC

Features:

Optoelectronic isolation between input, output and control signal circuit.
Red and green light-emitting diodes indicate the forward and reverse rotation status respectively.
Changing the control power terminal makes it easy to switch the output load voltage polarity.
Internal interlock control function is provided for safe and reliable switching.
The product is mainly used for frequent switching of single-phase DC motor forward and reverse rotation, switching of semiconductor refrigeration and heating, and other DC load power polarity conversion.

Part numbers

Model	Output voltage	Operating current	Control voltage
GTJ018-100P10	100VDC	10A	12-48VDC
GTJ018-100P20	100VDC	20A	12-48VDC
GTJ018-100P30	100VDC	30A	12-48VDC
GTJ018-100P40	100VDC	40A	12-48VDC
GTJ018-60P50	60VDC	50A	12-48VDC
GTJ018-60P60	60VDC	60A	12-48VDC
GTJ018-60P80	60VDC	80A	12-48VDC
GTJ018-60P100	60VDC	100A	12-48VDC

Specification

Model	*GTJ018*
Input power supply	12-15VDC	18-48VDC	100VDC	200VDC
Output Current	5～100A
Control Signal	12-48 VDC
Control current	8 to 15 mA
Switching time	≤ 10 Ms
On-state voltage	≤2 to 6 V
On-state current	10, 20, 40, 60, 80, 100 A
Off-state voltage	60V	100V	200V	400V
Off-state current	≤ 2 MA
Isolation voltage	≥1500 V
Adiabatic voltage	≥1500 V
Insulation resistance	≥100 MΩ
Operating Temperature	-25～75℃
Heat dissipation conditions	≥20A with heat sink, ≥50A plus fan strong cooling
Safety factor of load current	Resistive load 2.5-4 times; inductive load 3-5 times
Dimension (code)	94×34×50mm

Notes on product selection:

According to the size of the load power, different current margin should be selected. The larger the power, the larger the current margin. Generally, the current capacity of the solid state relay is 2.5 to 5 times the load current. In addition, add over-current protection to the load circuit to prevent short circuits. The method is: the load circuit is connected in series with a fast circuit breaker or fast fuse.

The output circuit of this model is equipped with an internal overvoltage protection circuit, which can be used without additional overvoltage protection as long as over-current protection is added. Over-current protection method: the input circuit is connected in series with a fast circuit breaker or fast fuse.

If the load power supply is taken from the AC power supply through rectification into DC pulsating power supply, the filter capacitor must be added at the power end for filtering. The size of the capacitance is determined by the size of the load current.

According to the size of the selected solid state relay current, working mode, environmental conditions,achoice of heat sink should be different, the area of the heat sink should be large rather than small.

When installing, it is required that the contact surface between the heat sink and the product shall be flat and smooth, and a layer of thermally conductive silicone grease shall be applied to its surface, and finally the screws set with flat washers and spring washers shall be tightened and fixed symmetrically.

FAQ

Q:The Critical Role of Safety Margins in DC SSR Selection

Selecting a DC Solid State Relay (SSR) with sufficient margin is a core principle for ensuring stable and reliable operation, as the semiconductor nature of these devices makes them extremely sensitive to overcurrent and overvoltage. This margin is essential to mitigate three critical risks: high inrush currents during startup (such as motor starting currents reaching 5-7 times the rated value), current-carrying derating caused by high-temperature environments, and high-voltage spikes generated when switching off inductive loads. Consequently, adhering to recommended safety factors- typically 2-4 times the rated current for resistive loads and 4-6 times for inductive loads- is not a waste of resources, but rather a vital "insurance policy" that protects the system against instantaneous shocks and ensures long-term reliability in engineering applications.

Q:What is a DC Motor Reversing Solid State Relay?

The DC Motor Reversing Solid State Relay is a contactless electronic switching device specifically designed to control the forward and reverse operation of DC motors. It utilizes two internally reverse-parallel MOSFET or IGBT sets to switch the motor phase sequence, thereby controlling the motor's forward and reverse rotation. Compared to traditional mechanical contactor-based solutions, it eliminates arcing, noise, and mechanical wear, offering higher reliability, faster response times, and longer service life.

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DC Reversing Solid State Contactor 10A-500A 100V-1200V

DC motor forward and reverse switching solid state relay,10-500A,100-1200VDC.