SIEMENS Impulse Relay 5TT4122-0 2S AC 230V 16A AC (5TT41220)

The SIEMENS 5TT41220 is a latching impulse relay that toggles two normally open contacts with each 230 V AC control pulse, making it a compact solution for lighting circuits controlled from multiple pushbuttons. Unlike standard monostable relays, it holds its switching state without continuous coil power, which reduces standby consumption and heat in the distribution board.

Highlights

• 2 NO contacts, 16 A rated operational current at 230 V AC
• Latching function: one pulse per switching operation, no permanent coil supply needed
• Only 1 module wide (18 mm) for DIN rail mounting
• Screw terminals accept solid conductors up to 4 mm² and stranded up to 2.5 mm²
• Mechanical endurance of 1,000,000 cycles and electrical endurance of 100,000 cycles

In daily use

Install the relay on a standard 35 mm DIN rail, connect the coil to the 230 V AC control circuit and the load to the two NO contacts. Each brief voltage pulse changes the contact state, allowing convenient switching from any number of parallel pushbuttons. The device operates at 50/60 Hz and is suitable for ambient temperatures from -25 °C to +55 °C.

Full specifications

• Product type: Impulse relay
• Switching function: Latching
• Number of contacts: 2
• Contact configuration: 2 NO
• Rated operational current (AC-1): 16 A
• Rated operational voltage: 230 V AC
• Control voltage (coil): 230 V AC
• Frequency: 50/60 Hz
• Mounting type: DIN rail
• Number of modules: 1
• Electrical endurance: 100,000 cycles
• Mechanical endurance: 1,000,000 cycles
• Connection type: Screw terminals
• Terminal capacity (solid wire): 0.5 - 4 mm²
• Terminal capacity (stranded wire): 0.5 - 2.5 mm²
• Operating temperature range: -25 to +55 °C

Final note

The relay is designed for fixed installation in dry indoor environments. Its compact width saves space in distribution boards, while the latching mechanism ensures reliable switching with minimal energy consumption.