SIEMENS Industrial Partner

Siemens 48ASD3M20 Overload Solid State Relay. NEMA Class 10, 20, and 30 | Trip curves | trip free design | phase loss protection | FLA adjustment dial with wide adjustment range | manual reset Simple Type: Relay

Class 48 self-powered solid-state overload relays generate their own running power, and do not need a separate source of 120V to power the circuit board. The overload also provides phase loss protection for the motor by tripping within three seconds, when there is a complete loss of one phase of the three phase motor branch circuit (Trip curves for Class 10, 20, and 30 overloads are shown in Fig.1). Each overload has a current adjustment range with the adjustment dial reading out in motor full load amps (FLA). In addition to the markings on the dial, there are audible clicks which allow for extremely fine tuning. Note that while thermal overloads require a heater selection based on a relatively wide range, these overloads have many clicks covering the same ampere range Fig 2.

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