Hongfa Industrial Relays

Hongfa industrial relays are designed for seamless integration with PLC output modules: Coil Voltage Compatibility - available in 12VDC, 24VDC, 48VDC, 24VAC, and 120VAC to match common PLC output voltages

24VDC is the most common for modern PLCs

Coil Current - low coil current (15-30mA) allows direct drive from PLC transistor outputs without external relays

Protection Features - built-in freewheeling diodes (DC coils) protect PLC outputs from back-EMF

LED Indicators - visual status indication helps with troubleshooting and maintenance

Mounting Options - DIN rail mounting allows installation in standard industrial enclosures alongside PLCs

Terminal Types - screw terminals or spring terminals for reliable field wiring

Contact Ratings - 6A to 16A ratings handle typical industrial loads (solenoids, contactors, lights)

Response Time - fast operate/release times (10-20ms) suitable for PLC scan cycles. For high-density applications, slim relays (HF41F) save DIN rail space. For motor loads, select relays with high inrush capability. All industrial relays are designed for 100k+ electrical life in industrial environments.

Select 24VDC coil relays with built-in diodes for direct PLC interfacing; use DIN rail mounting for control panel installation.

The HF18F and HF41F are both Hongfa industrial relays but with different form factors and applications: HF18F is a standard industrial relay (29.0x12.8x15.7mm) with 8A contact rating, suitable for general control applications

HF41F is a slim industrial relay (29.0x6.4x15.7mm) with 12A rating, designed for high-density installations. Key differences: Width - HF18F: 12.8mm, HF41F: 6.4mm (50% space savings)

Contact Rating - HF18F: 8A, HF41F: 12A

Height - both 15.7mm for consistent panel layout

Coil Options - both available in AC and DC

Features - both include LED indicators and protection diodes

Mounting - both support DIN rail and PCB mounting

Applications - HF18F for standard control panels, HF41F for compact designs

Price - HF41F typically has slight premium for space savings. For new designs with space constraints, HF41F enables 50% more relays per DIN rail length. For existing HF18F installations, HF41F can be mixed on the same rail. Both series offer equivalent reliability and protection features.

Choose HF18F for standard installations, HF41F for high-density applications requiring maximum relays per DIN rail.

Hongfa industrial relays include LED status indicators for visual troubleshooting and built-in freewheeling diodes (DC coils) to protect drive circuits from back-EMF. These features simplify system design and improve reliability.

Select relays with built-in protection features for reliable industrial applications.

Hongfa industrial relays support DIN rail mounting for easy installation in control panels. The standard 35mm DIN rail is industry standard. Both HF18F and HF41F series include DIN rail mounting clips.

Use DIN rail mounting for organized, serviceable control panel layouts.

AC coils are designed for alternating current and include shading rings to prevent chatter. DC coils are simpler but require flyback protection. Hongfa industrial relays are available in both AC (24-240V) and DC (12-48V) options.

Match coil type to your control voltage; DC is more common in modern systems.