Introduction
This manual provides essential information for the safe and effective use of the HEXEH SRS-24VDC-SL General Purpose Relay. This relay is designed for various control applications, offering reliable performance, vibration resistance, and excellent electromagnetic compatibility. Its compact and robust design makes it suitable for integration into temperature controllers and other automatic control systems.
Safety Information
Always ensure power is disconnected before installation, wiring, or maintenance. Improper installation or use can lead to electric shock, fire, or equipment damage. This device should be installed by qualified personnel in accordance with all local and national electrical codes.
- Do not exceed the specified voltage and current ratings.
- Avoid exposing the relay to excessive moisture or extreme temperatures outside its operating range.
- Ensure proper insulation and secure connections to prevent short circuits.
Specifications
The following tables detail the electrical and mechanical characteristics of the HEXEH SRS-24VDC-SL relay.
Ordering Information & General Characteristics Diagram
Image: A detailed datasheet showing ordering information, contact ratings, general characteristics, and coil data for the HEXEH SRS series relays. This includes insulation system, resistance, dielectric strength, operating times, humidity, ambient temperature, shock and vibration resistance, weight, and construction details.
Contact Rating
| Characteristic | Value |
|---|---|
| Contact Arrangement | A/B/C |
| Contact Resistance | 100mΩ (1A 6VDC) |
| Contact Material | Silver alloy: AgCdO, AgSnO2, AgNi |
| Max Switching Voltage | 1A/120VAC, 1A/250VAC, 3A/250VAC |
| Max Switching Current | 3A |
| Max Switching Power | 750VA |
| Electrical Endurance | 1x105 ops / 1x105 ops |
| Mechanical Endurance | 1x107 ops |
Coil Data (at 20°C) for SRS-24VDC-SL
| Power Dissipation | Voltage (VDC) | Current (mA) | Resistance (Ω) | Pick-up Voltage | Drop-out Voltage | Max Allowable |
|---|---|---|---|---|---|---|
| 0.36W (L) | 24 | 15 | 1600 | 75% Max | 5% Min | 130% |
General Characteristics
| Characteristic | Value |
|---|---|
| Insulation System | B/F |
| Insulation Resistance | 100MΩ (500VDC) |
| Dielectric Strength (between contacts and coil) | 500VAC 1 minute |
| Dielectric Strength (between open contacts) | 500VAC 1 minute |
| Operate Time (under nominal voltage) | <10ms |
| Release Time (under nominal voltage) | <10ms |
| Humidity | 85% RH (20°C) |
| Ambient Temperature | -40°C ~ +85°C |
| Shock Resistance (Functional) | 98m/s² |
| Shock Resistance (Destructive) | 980m/s² |
| Vibration Resistance (Double amplitude) | 10Hz-55Hz 1.5mm |
| Weight | Approx 4g |
| Construction | Sealed |
Physical Installation
The HEXEH SRS-24VDC-SL relay is designed for PCB mounting. Refer to the diagram below for physical dimensions and recommended PCB footprint.
Image: Technical drawing illustrating the physical dimensions of the relay and its corresponding PCB board diagram from a bottom view. It includes pin configurations for Conversion C type, Normally Open A type, and Normally Closed B type contacts. All dimensions are in millimeters with a tolerance of ±0.1mm.
Dimensions
- Maximum Length: 15.8 mm
- Maximum Width: 10.8 mm
- Maximum Height: 12.4 mm
- Pin Spacing (long side): 10.16 mm
- Pin Spacing (short side): 7.62 mm
- Pin Diameter: Approximately 0.6 mm
- Tolerance: ±0.1 mm
Wiring Diagrams
The PCB board diagram (bottom view) illustrates the pinout for different contact configurations. Ensure correct wiring based on your application requirements.
- Conversion C type: Features a common contact that switches between a normally open (NO) and a normally closed (NC) contact.
- Normally Open A type: The contact is open when the coil is de-energized and closes when the coil is energized.
- Normally Closed B type: The contact is closed when the coil is de-energized and opens when the coil is energized.
Connect the coil to a 24VDC power source. The contacts can then be used to switch an external circuit up to the maximum specified voltage and current ratings.
Operating Principles
The HEXEH SRS-24VDC-SL is an electromagnetic relay. When the coil is energized with 24VDC, an electromagnetic field is generated, which pulls the armature, causing the contacts to switch their state. When the coil is de-energized, the armature returns to its original position, and the contacts revert to their default state (normally open or normally closed).
The relay operates automatically based on the presence or absence of voltage across its coil. It is designed for rapid switching, with operate and release times typically under 10 milliseconds.
Maintenance and Troubleshooting
Maintenance
These relays are sealed units and generally require no routine maintenance. Periodically inspect the relay and its connections for any signs of physical damage, corrosion, or loose wiring. Ensure the operating environment remains within the specified temperature and humidity ranges.
Troubleshooting
- Relay not activating: Verify that the 24VDC coil voltage is present and stable. Check for correct polarity if applicable (though these relays are typically non-polar for the coil). Ensure the coil resistance matches specifications.
- Contacts not switching: Confirm the coil is receiving sufficient voltage to reach the pick-up voltage. Check for any mechanical obstruction or damage to the relay.
- Intermittent operation: Inspect all wiring connections for looseness or corrosion. Ensure the load current and voltage do not exceed the contact ratings.
- Overheating: This typically indicates an overload condition on the contacts or an incorrect coil voltage. Verify that the load current is within the relay's specifications.
Disposal
Dispose of this product in accordance with local environmental regulations. Do not dispose of with general household waste.