Electromagnetic Relay SPDT LEG-9# 9VDC 10A/120VAC

Electromagnetic Relay SPDT LEG-9# 9VDC 10A/120VAC is an electromechanical single-pole double-throw (SPDT) switching device with a 9 V DC coil and a contact rating of 10 A at 120 VAC. It is built for use in control panels, automation equipment and general electrical circuits where a compact, replaceable relay is required to switch moderate AC loads. The relay housing and contact arrangement provide a straightforward solution for switching between normally closed and normally open circuits with mechanical isolation between coil and contacts.

Advantages

The relay provides reliable mechanical switching with a clear electrical separation between the coil and the switched circuit, which helps protect control electronics. Its 9 V DC coil voltage is compatible with common low-voltage control systems, while the 10 A / 120 VAC contact rating supports a range of lighting, motor control and heater loads within that power envelope. The device’s compact footprint and standard pin layout simplify replacement and integration into relay sockets or custom PCBs.

Suitable for

• Control panels and relay modules
• Home and industrial automation circuits
• Switching lighting circuits and small motors
• Prototyping and repair of electrical assemblies

Key specifications

• Contact configuration: SPDT (single-pole double-throw)
• Coil voltage: 9 V DC
• Contact current rating: 10 A
• Contact voltage rating: 120 VAC
• Contact type: mechanical silver alloy or equivalent (for reliable switching)
• Mounting: through-hole or socket mount compatible form factor
• Isolation: mechanical separation between coil and contacts

How to use

Mount the relay in a compatible socket or solder it into the designated through-hole footprint on a PCB, ensuring correct orientation of coil and contact pins. Apply a stable 9 V DC supply to the coil terminals to actuate the internal mechanism and change contact state between the normally closed and normally open terminals. Wire the switched AC load to the common and appropriate contact terminal, observing the 10 A / 120 VAC limits. Verify coil polarity and wiring against the circuit diagram to prevent improper operation. For assemblies, allow adequate clearance and secure mounting to avoid mechanical stress on the pins.

Usage recommendations

Confirm that the switched load does not exceed the relay’s 10 A and 120 VAC ratings, and include appropriate fusing or overload protection in the circuit. Consider snubber networks or RC suppression across inductive loads and follow manufacturer guidance for contact protection when switching motors or inductive devices. Maintain ambient temperature and ventilation within specified ranges for reliable operation and replace the relay if contact wear or unreliable switching is observed.