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Green printed circuit board with relay, ten thermistors and two screw terminals

5000W High Power Soft Starter Board AC 220V 30A 40A Relay 10 Thermistors

SKU CH-8J3F-G4KZT

Limits inrush current up to 5000 W at 220 V AC using 10 thermistors and a 40 A relay with 30 A operating capacity

  • Limits inrush current with 10 NTC thermistors
  • Handles up to 5000W at AC 220V
  • 40A relay bypasses thermistors after ~3 seconds
  • No auxiliary power supply required
  • Simple two-terminal wiring for input and load

5000W Soft Starter Board for High-Current Loads

This 5000W soft starter board limits inrush current for AC 220V equipment such as Class A power amplifiers and isolation transformers. It uses ten thermistors and a 40A relay to suppress startup surges within the first few seconds. The module operates without an auxiliary supply and connects through two terminals for input and load. It is rated for a maximum operating current of 30A.

Check Mains Voltage and Load Rating Before

Verify that the supply is AC 220V and that the connected load does not exceed 5000W or 30A continuous current. The board provides only inrush limiting, not overload or short-circuit protection, so upstream fuses or breakers are still required. Ensure wiring terminals rated for the 7.62mm pitch can accommodate your cable gauge. This unit is not suitable for DC circuits or voltages other than 220V AC.

Ten Thermistors and 40A Relay Handle

On power-on, the ten negative-temperature-coefficient thermistors limit instantaneous current while they warm up. After approximately three seconds the 40A relay closes and bypasses the thermistors for normal operation. No extra control wiring or external power source is needed because the board draws its operating energy from the mains input. The relay and thermistor count are fixed and not user-configurable.

Highlights

  • Limits inrush current with 10 NTC thermistors
  • Handles up to 5000W at AC 220V
  • 40A relay bypasses thermistors after ~3 seconds
  • No auxiliary power supply required
  • Simple two-terminal wiring for input and load

Specifications

No published specifications for this item yet.

Questions about this item

What comes in the box and do I need to buy anything else to wire it up?

The package contains the soft-start board itself with its built-in 40 A relay and 10 thermistors. It has only two screw terminals — one for AC 220 V input and one for the load output — and needs no auxiliary power supply, so no extra modules are required.

The board is rated 5000 W, 30 A continuous and 40 A relay; which figure should I match to my amplifier or transformer?

Size the load so its steady-state draw stays at or below 30 A at 220 V (about 5000 W). The 40 A relay only handles the brief inrush peak; exceeding 30 A continuously will overheat the thermistors.

How does the 3-second soft-start change the way my Class A amplifier behaves at switch-on?

On power-up the 10 thermistors limit the inrush current for roughly 3 seconds; once they heat up the 40 A relay shorts them out and the amplifier runs at full 220 V with no added resistance.

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