In industrial and electrical-control contexts, a monitoring relay is a protective device that continuously measures one or more electrical (or physical) parameters, compares them against preset limits, and then changes state (e.g. closes or opens contacts, sends an alarm) whenever those parameters go outside the safe or desired range. Monitoring relays add an automatic layer of safety and control, guarding equipment and processes against faults such as over-/under-voltage, phase loss, current overload, temperature excursions, and more.
Littelfuse current and load monitoring relays, sensors, and transducers are the ideal solution for monitoring loads. These products protect against equipment damage from irregularities and predict risks before they cause problems. They monitor input and output currents passing through circuits for warning signs such as overvoltage or undervoltage, overcurrent or undercurrent, phase issues, and other indicators. Each protective unit provides an applicable response. Littelfuse offers...
Littelfuse offers a variety of voltage monitoring relays that are designed to protect industrial equipment against voltage fault conditions. These single-phase and three-phase system relays provide highly accurate and precise voltage measurements that activate a response to abnormal operating conditions in order to prevent harmful damage to equipment. The voltage monitoring relays not only detect under-voltages and over-voltages, they also detect related issues such as phase imbalance, phase loss, and phase sequence.
