The MSD 75643 is a four-channel solid-state relay in black, with 20A continuous and 50A instantaneous output per channel. It has no mechanical contacts and can be triggered by power supply or ground. It also features built-in over-temperature and short-circuit protection and LED diagnostics.

Specification

• Original Part Number (MPN): 75643
• Type: Solid State Relay Module (No Mechanical Contacts)
• Number of channels: 4 independent channels
• Current per channel: 20 A continuous; 50 A for a maximum of 8 seconds.
• Total output: 80 A continuous / 200 A instantaneous
• Power supply voltage: 5 – 20 V
• Triggering method: Single-wire trigger per channel, can be connected to 12V or ground.
• Trigger wire diameter: 18 – 22 AWG
• Recommended mains power cable gauge: 4 AWG for 80 A, 6 AWG for 60 A, and 12 AWG for 20 A.
• Protection functions: Automatic over-temperature, short-circuit, and overload protection; after tripping, removing the trigger signal and then restoring power will reset the circuit.
• Status indicators: Each channel has an independent LED to indicate normal conduction/off/fault.
• Channel parallel connection: Can be connected in parallel to drive loads exceeding the single-channel rating.
• Installation: Includes mounting hardware; the mounting feet can rotate 90° to accommodate different installation positions.
• Casing color: Black
• The box contains: 1 solid-state relay module and 1 mounting kit.