Siemens 3RP25551AW30 Asymmetrical Flasher Timing Relay, 24-240 V AC/DC, 2 CO, 0.05 s - 100 h, DIN Rail

Industrial control panels often need a reliable timing relay to generate asymmetrical pulse sequences for alarms, warning lights, or process cycling. The Siemens 3RP25551AW30 is an asymmetrical flasher timing relay that starts with a pulse, providing precise time-based control in automation systems. It operates on a wide voltage range of 24-240 V AC/DC, making it versatile for various electrical installations.

Key specifications

• Function: Asymmetrical flasher (start with pulse)
• Contacts: 2 change-over (CO)
• Operating voltage: 24 - 240 V AC/DC
• Timing range: 0.05 s - 100 h
• Number of time ranges: 7
• Connection: Screw terminals
• Mounting: DIN rail
• Rated insulation voltage: 250 V
• Rated impulse withstand voltage: 4 kV
• Thermal current: 5 A
• Switching capacity AC-15: 3 A at 230 V
• Switching capacity DC-13: 1 A at 24 V
• Operating temperature: -25 to +60 °C
• Protection class: IP20
• Electrical endurance: 100,000 switching cycles
• Mechanical endurance: 10 million switching cycles
• Setting accuracy: ±5%
• Repeat accuracy: ±1%

Why choose it

This relay offers high flexibility with seven selectable time ranges covering from 0.05 seconds to 100 hours. Its wide voltage input and two change-over contacts allow integration into diverse control circuits. The robust design ensures long mechanical life and reliable performance in industrial environments.

Ideal use cases

• Flasher circuits for warning lights and sirens
• Cyclic switching of motors or valves
• Pulse generation in automation sequences
• Process timing in manufacturing lines

Good to know

The relay is designed for DIN rail mounting and uses screw terminals for secure wiring. It has an IP20 protection rating, suitable for installation in control cabinets. The asymmetrical flasher function starts with a pulse, which can be important for certain control logic.