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1.0 Introduction
The InPower SSC3 Series is a family of high current solid state DC contactors. These contactors are available in
current ratings of 200 and 300 amps, and are packaged plastic case with a metal baseplate. As they have ex-
tremely low current draw when in the off state, they are ideally suited for use as load disconnect switches. A key
feature is the contactor's highly efficient, low on-resistance, DC power switch. This results in superior performance
by producing a low voltage drop and generating only a small amount if internal heat.
The SSC3 family also incorporates LoadLogic technology which automatically compensates for different types of
loads, starting up difficult loads, yet accurately detecting a dead short fault. It assists with starting up into resistive
loads, inductive loads, capacitive loads, incandescent loads, and identifies dead short faults.
The status LED indicator is on when the SSC3 is ON (off when OFF), and flashes to indicate a fault shutdown.
Automatic fault shutdown occurs for over-current, loss of ground, high/low-battery voltage, and/or over-
temperature. In a fault condition the contactor is latched in the off state. To reset the unit the faults must be
cleared; then the control input voltage must be removed (<4.0V), then re-applied (>8.0V). Removing the +BAT
cable will also reset the unit.
The control INPUT and GND inputs utilize a 8-32 Threaded Terminals. The brass nuts on the INPUT and GND
terminals shall be torqued to 4-5 inch lbs. Connections for the high current DC cables utilize 3/8" - 16 brass bolts
and copper washers with brass contact pads for low contact resistance. Four 0.20" mounting holes allow for solid
mounting to a secure metal surface.
+
Battery
Ground
+12 Volts
© Copyright 2021 InPower LLC
InPower SSC3-200A Solid State Contactor
Fuse
Control Switch
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
OWNERS MANUAL SSC3
Solid State Contactor Models:
SSC3-200A (200 Amps, 2 Lug)
SSC3-200B (200 Amps, 4 Lug)
SSC3-300 (300 Amps, 4 Lug)
LOAD
Ground
Page
SSC3 Owner's Manual
Document: OM-216 Version Code:
1 of 4
Date: Sept 13, 2021 Date:
+12 Volt Loads
Ground
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Summary of Contents for InPOWER SSC3
- Page 1 The status LED indicator is on when the SSC3 is ON (off when OFF), and flashes to indicate a fault shutdown. Automatic fault shutdown occurs for over-current, loss of ground, high/low-battery voltage, and/or over- temperature.
- Page 2 2.0 System Operation The SSC3 is controlled by a positive DC voltage on INPUT terminal. The turn ON voltage is +8.0 Vdc (Range of +8.0 to 18.0 Volts). The turn OFF voltage is <+4.0 Vdc. Note that the input voltage must drop to under +4.0 volts, then increase to +8.0 volts to turn on again.
- Page 3 To facilitate heat transfer, please apply a thin layer of silicon thermal material (user supplied) to the metal plate on the bottom of the SSC3. Smooth this out with a flat edge to insure there are no gaps Secure the contactor to the flat metal surface using four screws and tighten to a torque setting of 5 inch pounds.
- Page 4 Do Not Stack Lugs! If Multiple Terminations are necessary, (Optional User supplied) Small amount of Silicon Thermal Compound please refer to the SSC3-200B 6.0 Testing Procedure Make the following resistance measurements with a digital multimeter with all wires removed from the SSC3.
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