ABB Stotz S&J Load Shedding Relay E451-5.7A
Manufacturer: ABB Stotz S&J
Designation: Load Shedding Relay
Type: E451-5.7A
Rated Voltage: 230 V
Rated Current: 6.7..39 A
Trigger Current: 31..53 A
Max. Drop Delay: 10 ms
Max. Continuous Current: 43 A
Number of Contacts as Normally Open: 1
Rated Current (Control Contacts): 1 A
Max. Switching Voltage (Control Contacts): 400 V
Max. Switching Power (Control Contacts): 230 VA
Electrical Lifespan (Control Contacts): 100,000 Switching Cycles
Mechanical Lifespan (Control Contacts): 2,000,000 Switching Cycles
Max. Electrical Switching Frequency: 1800 c/h
Type of Voltage: AC
Mounting Type: DIN Rail
Width in Division Units: 1
Installation Depth: 60 mm
Protection Class (IP): IP40

ABB Stotz S&J Load Shedding Relay E451-5.7A: Additional Details
Priority switches are used in installations where existing conductor cross-sections or the size of the power supply connection do not allow simultaneous operation of two high-power consumers (e.g., storage heating and heat exchangers). Priority switches disconnect the long-term consumer (storage heating) as long as the short-term consumer (heat exchanger) is switched on. The coil of the priority switch is connected in series with the short-term consumer. When the consumer is turned on, the normally open contact of the priority switch disconnects, for example, the contactor of the heating system.