Durakool AFM20-303-M Mercury Displacement Relay
The Durakool AFM20-303-M is a single-pole, normally open (SPST-NO) mercury displacement relay designed for reliable and efficient switching in various industrial applications. Utilizing mercury as the contact material, this relay offers silent operation and exceptional durability, making it ideal for environments where frequent switching is required.
Key Features
- Coil Voltage: 120 VAC
- Contact Rating: 20A at 600 VAC
- Contact Configuration: SPST-NO
- Coil Resistance: 3.51 kΩ
- Mounting: Panel mount with quick-connect terminals
Applications
The AFM20-303-M is well-suited for a range of industrial applications, including:
- Lighting control systems
- Motor control circuits
- Heating equipment
- Industrial ovens
- HVAC systems
Advantages of Mercury Displacement Relays
Mercury displacement relays like the AFM20-303-M offer several benefits over traditional mechanical relays:
- Silent Operation: The use of mercury ensures noiseless switching, which is advantageous in noise-sensitive environments.
- Durability: Mercury contacts are resistant to corrosion and wear, providing a longer operational lifespan.
- Environmental Resilience: These relays perform reliably across a wide range of temperatures and pressures, and are unaffected by dust or vapor-filled atmospheres.
- Safety: The hermetically sealed design prevents external sparks, enhancing safety in volatile environments.
For more information on the Durakool AFM20-303-M Mercury Displacement Relay and other related products, please visit the manufacturer’s website or contact authorized distributors.



















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