SIEMENS Voltage Monitoring Relay 5TT3400 T5570 AC 230/400V 1W 0.7/0.9

In industrial control panels and building automation, the SIEMENS 5TT3400 voltage monitoring relay continuously checks supply voltage for under and overvoltage conditions. When voltage deviates from the set threshold, the relay's changeover contact switches to protect connected equipment or signal an alarm. It is a compact DIN rail mounted module, one module wide, suitable for distribution boards and machine control cabinets.

Key specifications

• Nominal supply voltage: AC 230/400 V
• Frequency: 50/60 Hz
• Power consumption: 1 W
• Output contact: 1 changeover (CO)
• Contact switching capacity: 5 A / 250 V AC
• Voltage setting range: 0.7 to 1.2 x nominal voltage
• Adjustable hysteresis: 0.5% to 5% of set value
• Adjustable response delay: 0.1 to 10 s
• Mounting: DIN rail 35 mm
• Module width: 1 module (18 mm)
• Operating temperature: -25 to +55 °C

Why choose it

The relay offers adjustable thresholds and delay to match specific application needs. Its compact size saves space in crowded enclosures, and the changeover contact provides flexibility for control or alarm circuits.

Ideal use cases

• Monitoring voltage in motor control centers
• Protecting HVAC equipment from voltage fluctuations
• Signaling undervoltage in lighting panels
• Building automation systems requiring voltage supervision

Good to know

The relay is suitable for AC networks with 230/400 V nominal voltage. It is designed for DIN rail installation and operates within a wide temperature range, making it reliable in various environments.