SPDT DC Signal Relay

ATO SPDT DC signal relays are available 9V, 12V, 24V DC coil voltage, optional coil nominal power 360mW, 200mW, 450mW, contact form SPDT (1C), 3A contact switching capability, rated load 1A 240VAC/30VDC, 3A 120VAC, compact and lightweight. These low signal relays are at wholesale price from ATO, which are widely used for switch, anti-theft monitoring, communication equipment, office equipment, medical equipment and security alarm system.

SPDT DC signal relay

Feature

3A contact switching capability.
Contact form: SPDT (1C).
High sensitive type, coil power is 200mW/360mW/450mW.
Standard DIP construction terminal.
Ultra – small type, gold – plated contacts.
Suit for complete machine wave soldering and integral cleaning process.
Main applications: Electric power protection, automation, communication.

Specification

Model		ATO-SR-FH38DC9V			ATO-SR-FH38DC12V			ATO-SR-FH38DC24V
Type		Standard Type	Sensitive Type	High Power Consumption Type	Standard Type	Sensitive Type	High Power Consumption Type	Standard Type	Sensitive Type	High Power Consumption Type
Coil Parameters (23℃)	Nominal Voltage	DC 9V			DC 12V			DC 24V
	Nominal Power	360mW	200mW	450mW	360mW	200mW	450mW	360mW	200mW	450mW
	Pick-up Voltage	≤6.75VDC	≤6.75VDC	≤6.75VDC	≤9VDC	≤9VDC	≤9VDC	≤18VDC	≤18VDC	≤18VDC
	Drop-out Voltage	≥0.45VDC	≥0.45VDC	≥0.45VDC	≥0.60VDC	≥0.60VDC	≥0.60VDC	≥1.20VDC	≥1.20VDC	≥1.20VDC
	Rated Current	40mA	22.2mA	50mA	30mA	17.6mA	37.5mA	15mA	8.3mA	18.75mA
	Coil Resistance	225Ω	450Ω	180Ω	400Ω	720Ω	320Ω	1600Ω	2880Ω	1280Ω
	Max Voltage	DC 11.7V	DC 11.7V	DC 11.7V	DC 15.6V	DC 15.6V	DC 15.6V	DC 31.2V	DC 31.2V	DC 31.2V

Contact Form: SPDT (1C)

Contact Resistance (Initial): ≤100mΩ (6VDC 0.1A)

Contact Material: AgNi + Gold Plating

Rated Load (Resistance Load): 1A 240VAC/30VDC, 3A 120VAC

Max. Switching Voltage: 240VAC30VDC

Max. Switching Current: 5A

Max. Switching Capacity: 360VA/30W

Min. Allowing Load: 5VDC 100mA

Insulation Resistance (Initial): 1000mΩ (500VDC)

Dielectric Strength Between Open Contacts (Initial): 500VAC, 1 min

Dielectric Strength Between Coil & Contacts (Initial): 1000VAC, 1 min

Operate Time: ≤10ms

Release Time: ≤5ms

Shock Resistance (Functional): 98m/s²(10g)

Shock Resistance (Destructive): 980m/s²(100g)

Vibration Resistance: 10Hz ~ 55Hz 1.5mm DA

Mechanical: 1 x 10⁷ops

Electrical: 1A 240VAC 1 x 10⁵ops (ON/OFF=1s/9s), 3A 120VDC 5 x 10⁴ops (ON/OFF=1s/9s)

Ambient Temperature: -25℃ ~ 70℃

Humidity: 5% to 85%

Termination: PCB (DIP Encapsulation)

Unit Weight: 5g

Construction: Plastic Sealed, Flux Proofed

Certification: CE, CCC, TUV, UL

Note: In order to maintain the initial performance parameters of the signal relay, please be careful not to drop it.

Dimension (Unit: mm)

Dimensions of SPDT DC signal relay

Performance Curve

Performance curves of SPDT DC signal relay

How to test the signal relay?

Test the contact resistance. Use the resistance of the multimeter to measure the resistance of the normally closed contact and the moving point. This resistor value should be zero. The resistance between the normally open contact and the moving point is infinite. This makes it possible to distinguish between closed and open contacts.

Test the coil resistance. Use a multimeter R × 10Ω to measure the resistance of the signal relay coil to determine whether there is an open circuit.

Measure the incoming voltage and current. An adjustable regulated power supply and an ammeter are used to input a set of voltages to the signal relay, and the ammeter is inserted into the power supply circuit for monitoring. Slowly turn up the supply voltage and record the pull-in voltage and current. For accuracy, you can try a few times to get the average.

Measure the release voltage and current.

SPDT DC Signal Relay

Feature

Specification

Dimension (Unit: mm)

Performance Curve

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