HFKM-012-SHST 12V Automotive PCB Relay 20A SPST Vertical Sealed Relay

The HFKM-012-SHST is a compact automotive-grade PCB relay designed for reliable medium-to-high current switching, durable performance, and safe electrical isolation in vehicle systems. Featuring a Form 1U (SPST / single pole changeover variant depending on design spec) contact configuration, this relay is ideal for automotive control modules, power distribution systems, and general-purpose high-current switching applications.

Operating with a 12VDC coil voltage and a 130 coil resistance, the relay delivers stable and efficient coil performance with a power consumption of approximately 1.1W. This ensures consistent actuation in standard automotive electrical environments while maintaining energy efficiency and dependable switching response.

The HFKM-012-SHST supports a maximum switching current of 20A, making it suitable for controlling demanding automotive loads such as lighting systems, fuel pumps, cooling fans, HVAC blowers, and other medium-power electrical components. Its robust contact system, built with AgSnO (silver tin oxide) contact material, ensures excellent arc resistance, low contact wear, and long operational life under repetitive switching conditions.

Designed with a plastic-sealed enclosure, the relay provides strong protection against dust, moisture, vibration, and environmental contaminants commonly found in automotive applications. This enhances long-term reliability and ensures stable operation in harsh under-hood and in-vehicle conditions.

The relay features a compact vertical PCB mounting design (15 × 17.5 × 19.5 mm) with 5-pin termination, allowing easy integration into automotive control boards, relay modules, and compact electronic assemblies. Its small footprint makes it ideal for space-constrained designs without compromising performance.

With a 500V isolation voltage rating, the HFKM-012-SHST ensures safe electrical separation between coil and contact circuits, improving system safety and protecting sensitive control electronics from high-voltage transients.

Key Features

Form 1U (SPST / single pole configuration)

12VDC coil voltage

20A high switching capacity

130 coil resistance (1.1W power consumption)

AgSnO contact material for durability and arc resistance

Plastic-sealed construction for environmental protection

500V isolation voltage between coil and contacts

Compact vertical PCB mount design

5-pin configuration

Automotive-grade reliability

Typical Applications

Automotive electrical systems

Engine control and power distribution modules

Lighting and headlamp circuits

Cooling fan and HVAC systems

Fuel pump control

General-purpose vehicle switching applications

The HFKM-012-SHST combines compact PCB-friendly design, solid 20A switching performance, and automotive-grade durability, making it a reliable choice for engineers designing safe, efficient, and long-lasting vehicle control systems.

What's in the box
1 x HFKM-012-SHST 12V Automotive PCB Relay 20A SPST Vertical Sealed Relay