25A Relay Contactor | Single and Three-phase

25A Relay Contactor | Single and Three-phase

A 25A Relay Contactor (often referred to as a modular AC contactor) acts as a heavy-duty bridge between a low-power control signal and a high-power electrical load. While a standard relay is typically used for small electronics, a contactor is designed specifically to switch high currents - up to 25A - safely and repeatedly.

Core function of a relay contactor

It uses an internal electromagnetic coil to pull a set of heavy-duty contacts together. This allows a small device (like a smart switch, thermostat, or timer) to control a large appliance that would otherwise melt the small device's internal circuitry directly.

Reason to use a 25A relay contactor

• Load protection: it prevents high inrush currents from damaging delicate control hardware.
• Galvanic isolation: it physically separates the control circuit from the high-power circuit, increasing safety.
• Durability: the contact points are made of robust silver alloys designed to resist the arcing that occurs when high-voltage circuits are opened and closed.

Specifications

• Operational voltage (Ue):
  • Single-phase: 250V
  • Three-phase: 400V
• Control voltage: 220~240VAC @ 50/60Hz
• Insulation Voltage (Ui): 500V
• Slightly inductive loads (AC-7a): 25A
• High-inductive motor loads (AC-7b): 9A
• Mounting type: DIN rail
• Poles:
  • Single-phase: 2-pole
  • Three-phase: 4-pole
• Contact state: NO (normally open)

Available in single or three-phase. Please use a qualified electrician to install the unit.

If you have a samite DB board and need an DIN rail adaptor [click here]

Typical applications (not limited to)

• Geysers
• Water heaters
• Pumps
• Large scale lights

What is in the box?

• 1 x 25A Relay Contactor