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KSR-1-RSR25-B Interface Solid State Relay – Compact and Reliable AC Switching

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KSR-1-RSR25-B Interface Solid State Relay – Compact and Reliable AC Switching

Relpol introduces the modern KSR-1-RSR25-B interface solid state relay to its product range. This solution is designed for safe and silent switching of single-phase AC loads, particularly in applications requiring high durability and operational reliability.

Modern Solid State Relay (SSR) Technology
The KSR-1-RSR25-B belongs to the group of single-phase solid state relays (SSR – Solid State Relay), using an SCR (thyristor) output stage. Unlike conventional electromechanical relays, the SSR design eliminates moving parts, which ensures:

  • No contact wear,
  • Silent operation,
  • Long service life in intensive switching cycles.

The relay also provides zero-cross switching, which reduces inrush currents and minimizes disturbances in the power supply network.

KSR

Technical Parameters

  • Rated load current: 5 A
  • Load voltage range: 24…530 V AC (single-phase)
  • Maximum surge current: 250 A / 10 ms
  • On-state voltage drop: max. 1.5 Vrms
  • Maximum off-state leakage current: 5 mA

Safe DC Control and High Isolation
The relay is controlled by a DC signal in the range of 4…32 V DC, with a maximum control current of 25 mA. This enables direct cooperation with PLC systems and industrial automation circuits.

An additional advantage is the optical isolation between input and output, with a dielectric strength of up to 4000 Vrms, significantly increasing installation safety.

Built-in Protection and Status Indication
The relay is equipped with components supporting stable operation in industrial environments:

  • RC protection (built-in resistor and capacitor),
  • Green LED indicator showing the operating status.

These features enhance reliability and simplify diagnostics in control cabinets.

DIN Rail Mounting and Compact Design
The KSR-1-RSR25-B is an interface relay supplied as a set:

  • Solid state relay + KSR-1 plug-in socket,
  • Direct mounting on a 35 mm DIN rail according to PN-EN 60715.

The device dimensions are only 96 × 17 × 62 mm, allowing significant space savings in distribution boards.

Typical Applications
The KSR-1-RSR25-B relay is intended for controlling, among others:

  • Lighting systems,
  • Small motors,
  • Vending machines,
  • Medical equipment,
  • Valves and actuators in automation systems.

The KSR-1-RSR25-B is a modern single-phase interface solid state relay (SSR) designed for switching AC loads up to 5 A and 530 V. With zero-cross switching, 4000 Vrms optical isolation, compact DIN rail housing, and integrated RC protection, it provides a reliable solution for industrial automation and specialized applications.

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