Editorial Technical Reference

Control Relay

This page explains how Control Relay is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An electromechanical switch used to control electrical circuits within the Treatment Timer system.

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Control Relay in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Control Relay

Definition
A control relay is a critical component within the Treatment Timer system that functions as an electrically operated switch. It receives low-power control signals from the timer's logic circuit and uses these signals to open or close higher-power electrical circuits that control treatment processes. This enables the Treatment Timer to safely and precisely manage the activation and deactivation of treatment equipment according to programmed schedules. The relay is designed for industrial electrical equipment manufacturing and is classified as a component. It is typically used in control panels where isolation between control and load circuits is required. The relay's coil voltage is 24 V DC ±10%, and its contact rating is 10 A for AC-1 resistive loads at 250 V AC. The contact configuration is 2NO 2NC, but it can be configured to 4NO or 4NC. The mechanical life is 10 million operations under no-load conditions, and the electrical life is 100,000 operations at rated load. The response time is 15–20 ms for pick-up and drop-out. The operating temperature range is -40 to 85 °C, and the degree of protection is IP54–IP65 depending on the enclosure. The insulation voltage is 690 V AC. The contact material is silver tin oxide (AgSnO2) for high inrush applications. The weight ranges from 35 to 50 g, and dimensions are approximately 28×28×40 mm (L×W×H). These parameters are reference values and must be verified with the manufacturer for the specific model. The relay complies with IEC 60947-5-1 for control circuit devices, and environmental testing per IEC 60068-2-1/2. Always confirm model-specific values and standards with the legal manufacturer or supplier before procurement.
Working Principle
The control relay operates on electromagnetic principles. When the Treatment Timer's control circuit applies a voltage to the relay coil, it generates a magnetic field that attracts a movable armature. This mechanical movement causes electrical contacts to open or close, thereby switching the connected load circuit (e.g., pumps, heaters, valves) on or off. When the control voltage is removed, a spring returns the armature to its default position. This allows the relay to isolate low-power control signals from higher-power load circuits, ensuring safe and reliable switching.
Common Materials
Copper (coil and contacts), Steel (core and frame), Plastic (housing and insulation)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Coil Voltage24 ±10% V DCStandard control voltage; other voltages availableIEC 60947-5-1
Contact Rating10 AAC-1 resistive load at 250 V ACIEC 60947-5-1
Contact Configuration2NO 2NCConfigurable to 4NO or 4NC
Mechanical Life10 million operationsUnder no-load conditionsIEC 60947-5-1
Electrical Life100000 operationsAt rated loadIEC 60947-5-1
Response Time15–20 msPick-up and drop-out time
Operating Temperature-40–85 °CStorage and operationIEC 60068-2-1/2
Degree of ProtectionIP54–IP65Depends on enclosureIEC 60529
Insulation Voltage690 V ACRated insulation voltageIEC 60947-5-1
Contact MaterialAgSnO2Silver tin oxide for high inrush
Weight35–50 gDepending on model
Dimensions (L×W×H)28×28×40 mmApproximate, varies with model

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
  • Electromagnetic Coil
    Generates magnetic field when energized to actuate the relay
    Material: Copper wire with insulation
  • Armature Part
    Movable component that transfers magnetic force to contact mechanism
    Material: Steel or iron alloy
  • Contact Set Part
    Electrical contacts that open or close the load circuit
    Material: Silver alloy or other conductive material
  • Spring Part
    Returns armature to default position when coil is de-energized
    Material: Spring steel

Applied To / Applications

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

Treatment Timer
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Safety Barrier and Door Interlock
View system integration details
Timer/Controller
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
current: Up to 10A
voltage: Up to 600V AC/DC
temperature: -20°C to +70°C
switching frequency: Up to 3600 operations/hour
Media Compatibility
✓ Clean air environments ✓ Dry electrical panels ✓ Low-vibration industrial controls
Unsuitable: High-moisture or corrosive chemical atmospheres
Sizing Data Required
  • Control voltage (coil voltage)
  • Load current rating (contact rating)
  • Number of poles/contacts required

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Contact Welding
Cause: Excessive inrush current or frequent switching of inductive loads causing arcing and material transfer between contacts, leading to permanent fusion.
Coil Failure
Cause: Overvoltage, voltage spikes, or thermal degradation from ambient heat or internal resistance heating, resulting in insulation breakdown or open circuit in the coil winding.
Maintenance Indicators
  • Audible buzzing or chattering from the relay enclosure during operation
  • Visible signs of overheating such as discoloration, melting, or charring on the relay housing or surrounding components
Engineering Tips
  • Install snubber circuits or surge suppressors across inductive loads to reduce contact arcing and voltage spikes that accelerate contact erosion and coil stress.
  • Implement regular infrared thermography inspections to detect abnormal heating patterns and schedule preventive maintenance before thermal degradation causes failure.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 61810-1:2015 (Electromechanical elementary relays) UL 508 (Industrial Control Equipment) EN 61810-1:2015 (Electromechanical elementary relays - General and safety requirements)

Quoted from the published standard.

Manufacturing Precision
  • Contact Resistance: ≤ 50 mΩ
  • Operate/Release Time: ±10% of rated value
Quality Inspection
  • Dielectric Strength Test (Hi-Pot)
  • Contact Bounce Measurement

Manufacturers of Control Relay

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

GEYA Electric
Zhejiang, CN
Also makes: Surge Protection Device (SPD), Automatic Transfer Switch, Surge Protection Device and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Level Control Relay”
View source page ↗ geya.net · checked 2026-09-01
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Greegoo Electric
Zhejiang, CN
Also makes: Current Transformer (CT), Semiconductor Device, Power Semiconductor and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “EM25GA38-SSR-control-relay”
View source page ↗ greegoo.com · checked 2026-08-26
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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Frequently Asked Questions

What is the coil voltage of this control relay?

The standard coil voltage is 24 V DC with a tolerance of ±10%. Other voltages may be available, but you must confirm with the manufacturer for the specific model.

What is the contact rating?

The contact rating is 10 A for AC-1 resistive loads at 250 V AC, according to IEC 60947-5-1. Always verify the rating for your specific application.

Can the contact configuration be changed?

The standard configuration is 2NO 2NC, but it can be configured to 4NO or 4NC. Check with the supplier for available options.

What is the mechanical and electrical life?

The mechanical life is 10 million operations under no-load conditions, and the electrical life is 100,000 operations at rated load. These are reference values; actual life depends on operating conditions.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

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

Preliminary Technical Classification
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