Solid State Relay VS Mechanical Relay - Which One is Best?
Since the genesis of solid-state relays some decades ago, the argument about which is better, solid-state relays (SSRs) or electromechanical relays (EMRs), has raged on. The answer is neither, as each relay type has positive and negative aspects. But if you factor in specific application requirements, clear winners emerge.
When should you use each type?
Whether to use an EMR or SSR depends on a number of factors such as the application's environment, electrical requirements, and cost or budget.
Use SSR for ...
- Applications requiring high speed and frequent switching operations.
- Applications in high vibration environments.
- Application where the relay has to be located near sensitive automation components, such as PLC's, HMIs, and temperature controllers.
- Applications in dusty or humid environments.
- Applications in hazardous locations (presence of fumes or gases)
Use EMR for...
- Applications requiring a wide output range from the relay.
- Applications using motors & transformers requiring high starting amps.
- Applications where the initial installation budget is very limited.
Applications prone to current surges and voltage spikes.
EMR or SSR...either way, we have you covered
Doran Scales offers both types of relays in our Internal Relay option (Part# EXOPT106) and our External Relay Option (Part# EXOPT107). These options are available on our checkweigher scales, bench scales, and complete scale systems.