Electromagnetic Relay

Product Specifications

Technical details and manufacturing context for Electromagnetic Relay

Definition

Within a Control Relay Module, the electromagnetic relay serves as the core switching component that isolates control circuits from load circuits. It receives low-voltage control signals and uses electromagnetic force to physically open or close contacts, allowing safe and reliable control of higher-power electrical loads in industrial automation, motor control, and protection systems. The relay is designed for applications where electrical isolation between the control side and the load side is required, preventing interference and enhancing safety. It is commonly used in programmable logic controllers (PLCs), industrial control panels, and various automation equipment. The relay's construction includes a coil wound with copper wire around an iron core, a set of contacts made from silver alloy, a plastic housing, and spring steel components for mechanical return. These materials are selected for their electrical conductivity, magnetic properties, and durability. The relay operates within a specified coil voltage range of 5–24 V DC, with contact current ratings from 5 to 30 A for resistive loads, and a maximum switching voltage of 250 V AC. Coil power consumption typically ranges from 0.36 to 0.9 W. Operate time is ≤15 ms, and release time is ≤10 ms. Mechanical life is ≥10^7 operations without load, and electrical life is ≥10^5 operations at rated resistive load. The operating temperature range is -40 to 85 °C. Insulation resistance is ≥100 MΩ at 500 V DC between coil and contacts, and dielectric strength is 1500 V AC for 1 minute. Contact resistance is ≤50 mΩ initially at rated current. The relay weighs between 10 and 30 g, typical for PCB mount relays. These parameters are reference ranges; actual values must be confirmed with the manufacturer for the specific model. The relay does not have any specific standards listed on file, so users should verify compliance with applicable industry standards for their application. When selecting a relay, consider the coil voltage, contact ratings, and environmental conditions. Verify the relay's performance under actual load conditions, especially for inductive loads, which may require derating. Regular maintenance should include checking for contact wear and ensuring proper coil operation. Failure modes include contact welding, coil burnout, and mechanical failure, which can be detected by abnormal operation or increased contact resistance.

Working Principle

When a control voltage is applied to the relay coil, it generates a magnetic field that attracts an armature. This mechanical movement causes the contacts to change state (open or close), thereby switching the connected load circuit. When the control voltage is removed, a spring returns the armature to its original position. The relay provides electrical isolation between the control and load circuits, as the only connection is through the magnetic field and mechanical linkage.

Common Materials

Copper wire (coil), Iron core, Silver alloy (contacts), Plastic housing, Spring steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coil Voltage	5–24 V DC	Standard range; other voltages available on request
Contact Current Rating	5–30 A	Resistive load; derate for inductive loads
Contact Voltage Rating	250 V AC	Maximum switching voltage
Coil Power Consumption	0.36–0.9 W	Typical for standard relays
Operate Time	≤15 ms	Time from coil energization to contact closure
Release Time	≤10 ms	Time from coil de-energization to contact opening
Mechanical Life	≥10^7 operations	Without load
Electrical Life	≥10^5 operations	At rated resistive load
Operating Temperature	-40–85 °C	Storage and operating range
Insulation Resistance	≥100 MΩ	At 500 V DC between coil and contacts
Dielectric Strength	1500 V AC	Between coil and contacts for 1 minute
Contact Resistance	≤50 mΩ	Initial value at rated current
Weight	10–30 g	Typical for PCB mount relays

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Coil
Generates electromagnetic field when energized by control voltage

Material: Copper wire
Armature Part
Movable iron part attracted by electromagnetic force to operate contacts

Material: Iron/steel
Contacts Part
Electrical switching elements that open/close the load circuit

Material: Silver alloy
Spring Part
Returns armature to original position when coil is de-energized

Material: Spring steel
Yoke Part
Provides magnetic path and structural support for the relay

Material: Iron

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Control Relay Module

View system integration details

Manufacturers of Electromagnetic Relay

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

HONGFA

Xiamen, Fujian, CN

Also makes: AC-DC Converter, Power Supply Module, Current Transformer and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the typical coil voltage range for this relay?

The standard coil voltage range is 5–24 V DC, but other voltages may be available on request. Always confirm the exact coil voltage for your specific model with the manufacturer.

Can this relay switch inductive loads?

The contact current rating is specified for resistive loads. For inductive loads, derating is required to avoid premature contact wear. Consult the manufacturer for guidance on derating factors.

What is the mechanical life of the relay?

The mechanical life is at least 10^7 operations without load. This indicates the expected durability of the mechanical parts under no electrical load.

What are the operating temperature limits?

The relay is designed to operate and be stored in a temperature range of -40 to 85 °C. Ensure that the ambient temperature stays within these limits to maintain reliable operation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 101.3 kPa (standard), up to 200 kPa for sealed types
other spec:	Contact rating: 1A to 30A typical, Coil voltage: 5V to 240V DC/AC, Switching frequency: ≤10 Hz mechanical, Insulation resistance: ≥100 MΩ
temperature:	-40°C to +85°C (operating), -55°C to +105°C (storage)

Product Specifications

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