Relays are important control parts in modern industrial control, home appliances, and power systems. Their reliability, safety, and longevity have a direct effect on how well the system works and how users feel about it. The FH51 / FH51TP Series High-Power Relays deliver outstanding switching capability, insulation performance, and flexible mounting options, providing stable, safe, and durable control solutions for a wide range of high-load applications.

Product Overview

The FH51 series relays utilize a Class F UL insulation system and offer a maximum switching capacity of up to 50A. They support two mounting methods—PCB terminals and quick-connect terminals—to accommodate different structural designs and production processes. The products adhere to RoHS environmental standards, rendering them appropriate for applications with stringent safety, environmental protection, and long-term dependability requirements.

Key Advantages 

High Load Switching Capability for High-Power Equipment

Normally open (NO) contacts support 30A / 40A / 50A at 250/277VAC; normally closed (NC) contacts support 3A at 250/277VAC

Maximum switching capacity reaches 13850VA, capable of handling high-power devices such as air conditioner compressors, heaters, and industrial motors

Excellent Insulation and Dielectric Strength for System Safety

Dielectric strength between coil and contacts: 4000VAC, ensuring reliable isolation between high- and low-voltage circuits

Creepage distance: 8mm, effectively enhancing electrical safety margin and reducing leakage risk

Initial insulation resistance: 1000MΩ (at 500VDC) for long-term stable operation

Multiple Contact Arrangements and Mounting Options for Flexible Adaptation

Available with 2A (two NO contacts) and 2C (two changeover contacts) to meet various control logic requirements

Choose between PCB terminals or quick-connect terminals (TP) to facilitate automated assembly and on-site maintenance, improving production efficiency

Wide Coil Voltage Range and Low Power Consumption

Coil voltage options: DC 5V / 6V / 12V / 24V / 48V / 110V, compatible with various control circuits

Rated power: 1.7W, balancing reliable pull-in performance with system energy efficiency

Robust Performance in Harsh Environments

Operating temperature range: -40℃ to 65℃, suitable for extreme cold and high-temperature conditions

Vibration resistance: 10Hz~55Hz, 1.65mm DA; shock resistance: 980m/s² (100g), ideal for industrial equipment with frequent vibration

Available in flux proofed and plastic sealed constructions to match environmental cleanliness:

Flux proofed: recommended for clean environments free of H₂S, SO₂, NO₂, and dust

Plastic sealed: recommended for unclean environments containing the above contaminants, enhancing long-term reliability

Typical Applications

Household Appliances: air conditioners, water heaters, microwave ovens, electric heaters, dehumidifiers

Industrial Control: motor control, power management systems, automation equipment, industrial heating equipment

Power Systems: smart meters, power distribution control, charging facilities, new energy equipment

Summary

The FH51 / FH51TP Series High-Power Relays combine high load capability, strong insulation performance, flexible configuration, and harsh-environment adaptability, making them an ideal choice for high-reliability control systems. Whether for household appliances, industrial equipment, or power systems, the FH51 series provides a stable, safe, and durable core control component for your designs.