Siemens 3RP2574-1NW30 Timing Relay Star-Delta 1-20s 12-240V AC/DC

The Siemens 3RP2574-1NW30 is a SIRIUS electronic timing relay designed for star-delta (wye-delta) motor starting applications. It provides one NO delayed output and one NO instantaneous output, with a single adjustable time range of 1 to 20 seconds. A control supply voltage of 12 to 240 V AC/DC at 50/60 Hz covers a wide range of panel voltages within a single device.

Technical specifications:

• MLFB: 3RP2574-1NW30
• Manufacturer: Siemens
• Product line: SIRIUS
• Function: Star-delta (wye-delta) timing relay
• Time range: 1-20 s (1 range)
• Control supply voltage: 12-240 V AC/DC, 50/60 Hz
• Operating range: 0.8 to 1.1 x rated voltage
• Contacts: 1 NO delayed, 1 NO instantaneous
• Contact material: AgSnO2
• Thermal current: 5 A
• Operational current AC-15: 3 A (at 24 V and 250 V)
• Recovery time: 250 ms
• Power loss: max 2 W
• Setting accuracy: ±5% of full scale; repeat accuracy: ±1%
• Insulation voltage: 300 V (overvoltage category III, pollution degree 3)
• Surge voltage resistance: 4 000 V
• Mechanical service life: 10 000 000 operating cycles
• IP rating: IP20 (front, per IEC 60529)
• Short-circuit protection: fuse gL/gG 4 A
• Terminals: removable screw terminal, 0.5-4 mm², M3 (0.6-0.8 Nm)
• Mounting: screw or snap-on onto 35 mm DIN rail, any position
• Dimensions (WxHxD): 22.5 x 100 x 90 mm
• Weight: 151 g

Features and benefits:

• Wide 12-240 V AC/DC supply range serves most panel voltages without additional relays
• Removable screw terminals accept 0.5-4 mm² conductors for straightforward wiring
• 22.5 mm wide housing enables zero-gap side-by-side DIN rail installation
• Mechanical endurance of 10 000 000 cycles for long-life panel applications
• Star-delta and instantaneous contacts combined in one compact unit

Applications:

• Star-delta motor starting sequences in industrial motor control centres
• DIN rail-mounted control cabinets requiring timed contactor switching
• Three-phase motor panels with variable or mixed AC/DC supply voltages
• Automation systems where reduced motor starting current is required

Compliant with IEC 61812-1. Part of the Siemens SIRIUS 3RP25 range.

Also known as: Siemens 3RP2574-1NW30, SIRIUS wye-delta timing relay.