1pc HONGFA JQX-62F-012-1H-F Power Relay 4Pin 12VDC 20A 125VAC

HONGFA · Power Relay · JQX-62F Series · 12VDC Coil · In stock

What Is the HONGFA JQX-62F-012-1H-F Power Relay?

The HONGFA JQX-62F-012-1H-F is a 4-pin single-pole single-throw (SPST-NO) electromagnetic power relay with a 12VDC coil and contacts rated for 20A at 125VAC. It belongs to the JQX-62F series — HONGFA's workhorse power relay family used extensively in appliances, HVAC equipment, industrial controls, and automotive circuits. When the 12V coil is energized, an internal armature closes the main contacts, allowing high-current AC loads to be switched by a low-power DC control signal.

In short: This is a 12V DC coil, 20A-rated SPST power relay with 4 pins. If you are replacing a relay with the same coil voltage, contact form, and pin layout, verify the physical footprint matches before ordering. HONGFA is a major relay manufacturer with products widely used as OEM components in appliances and industrial equipment.

Understanding This Relay's Specifications

1. Coil Voltage: 12VDC

What this means: The relay coil requires a 12V DC power source to energize. Applying 12VDC across the coil terminals creates a magnetic field that pulls the internal armature, closing the main contacts.
Why it matters: Applying the wrong coil voltage — for example, 24VDC or 120VAC — will either fail to pull in the contacts (too low) or burn out the coil instantly (too high).
How to verify: The coil voltage is printed on the relay case. Look for "12VDC" or "12V DC" on the top or side of the relay body. Measure your circuit's control voltage at the relay socket before ordering a replacement.

2. Contact Rating: 20A at 125VAC

What this means: The relay contacts can safely carry and switch up to 20 amps of alternating current at up to 125 volts.
Why it matters: Exceeding the contact rating — either in current or voltage — causes excessive arcing during switching, which erodes the contact surfaces, increases contact resistance, and can eventually weld the contacts together or cause a fire.
How to verify: The contact rating is typically printed on the relay case or available in the JQX-62F datasheet. Always derate by 20-30% for inductive loads (motors, solenoids, transformers) due to inrush current.

3. Contact Form: SPST-NO (1 Form A), 4 Pins

What this means: SPST-NO stands for Single Pole Single Throw - Normally Open. The relay has one set of contacts that are open (disconnected) when the coil is de-energized, and closed (connected) when the coil is energized. The "1H" in the part number confirms this is a single Form A (normally open) contact arrangement.
Why it matters: If your original relay is SPDT (5 pins, with both NO and NC contacts), this SPST relay cannot serve as a direct replacement because it lacks the normally-closed contact. Always match the contact form when replacing a relay.

Key Specifications

Where This Relay Is Typically Used

• Home appliances: Air conditioner compressor control, microwave oven power switching, washing machine motor and heater circuits.
• HVAC equipment: Fan motor control, electric heat staging, compressor contactor control in residential and light commercial systems.
• Industrial controls: PLC output expansion (interposing relay), solenoid valve switching, small motor starters, and alarm annunciation circuits.
• Automotive circuits: Headlight relays, cooling fan control, horn relays, and auxiliary lighting where 12VDC coil voltage matches the vehicle electrical system.

Frequently Asked Questions

How do I test whether my existing relay is bad?

Remove the relay from its socket. First, measure the coil resistance across the coil pins using a multimeter — you should see a resistance in the range of tens to hundreds of ohms (not open circuit and not zero). Next, apply the rated coil voltage (12VDC) to the coil terminals and listen for an audible click. While holding the coil energized, measure the resistance across the contact pins — it should read near zero ohms (closed). When you remove coil power, the contact resistance should go to infinite (open). If the coil is open, the contacts are welded closed, or the relay fails to click, it needs replacement.

What is the difference between the JQX-62F and JQX-62 series?

The JQX-62F is a specific variant within the broader JQX family from HONGFA. The "F" suffix typically denotes a specific contact material, sealing type, or pin configuration within the series. Different suffix letters correspond to different contact ratings, environmental sealing (dust cover vs. fully sealed vs. flux-tight), and terminal styles (PCB mount vs. quick-connect). When cross-referencing, match the complete part number including suffix characters to ensure full compatibility.

Can I use this relay for a DC load instead of AC?

Relays with AC-rated contacts can switch DC loads, but the DC current rating is typically lower than the AC rating. This is because DC arcs do not self-extinguish at the zero-crossing point the way AC arcs do, so the contacts experience more erosion per switching cycle. Check the JQX-62F datasheet for the specific DC switching rating. As a rule of thumb, the DC rating at 30VDC is often around 30-50% of the AC rating. If you need to switch a high-current DC load, contact us with your specific voltage and current values so we can help verify suitability.

Do I need a flyback diode across the coil?

If the relay coil is being switched by a solid-state device such as a transistor, MOSFET, or PLC transistor output, a flyback (freewheeling) diode should be installed across the coil terminals (cathode toward positive, anode toward negative) to absorb the inductive voltage spike that occurs when the coil is de-energized. Without this diode, the spike can damage the switching transistor. If the relay is driven by a mechanical switch or a relay-output PLC module, the diode is less critical but still recommended as good engineering practice.

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