SIEMENS 3UB8123-4CW2 Relay
It is a multifunctional monitoring relay, belonging to the SIRIUS 3UB series of Siemens, mainly used for voltage, current, frequency or temperature monitoring in industrial electrical systems, and providing alarm or protection control signals.
1. Core features
(1) Basic parameters
Type: digital monitoring relay (programmable logic).
Input signal:
Voltage monitoring (such as overvoltage/undervoltage, range 24-240V AC/DC).
Current monitoring (optional current transformer input).
Frequency monitoring (such as grid frequency 50/60Hz abnormal detection).
Temperature monitoring (requires external PT100/PT1000 and other temperature sensors).
Output mode:
Relay output (1×CO, SPDT, 5A/250V AC).
Solid-state output (SSR) (optional model).
Current power supply: 24-240V AC/DC (wide range compatible).
Setting method:
Knob/button adjustment (direct panel setting threshold).
Communication interface (some models support Modbus RTU/Profibus DP).
(2) Monitoring function
Overvoltage/undervoltage protection (such as cutting off the device when the grid voltage fluctuates).
Phase sequence/phase loss detection (for three-phase motor protection).
(3) Mechanical and environmental characteristics
Mounting method: DIN rail mounting (standard 35mm).
Protection level: IP20 (suitable for installation in control cabinet).
Operating temperature: -25°C to +55°C.
Certification standards: CE, UL, IEC 60947.