Siemens Timing relay with star-delta (wye-delta) function, 2NO

Product Overview

The Siemens 3RP2576-1NW30 is a DIN-rail mounted electronic timing relay from the SIRIUS 3RP25 series, configured for star-delta (wye-delta) motor starting circuits. It combines a delayed contact and an instantaneous contact to manage the switching sequence between star and delta connections, thereby enabling reduced-voltage motor start-up. The unit operates with a broad supply voltage range and is designed for compact control panels, providing reliable time-based switching with adjustable delay.

Key Features

• Electronic timing relay — star-delta (wye-delta) function
• Output contacts: 2 NO (one delayed, one instantaneous)
• Adjustable time delay: 3 … 60 s — selectable via front panel dial
• Supply voltage: 12 … 240 V AC or DC — wide flexibility for control circuits
• Mounting: DIN-rail (standard 35 mm rail) — space-efficient panel installation
• Compact width: 22.5 mm — suitable for dense relay cabinets
• Screw-type terminals — secure and easy wiring
• LED status indicator — provides visual feedback on relay status
• Designed for control and motor-starting applications (star-delta) — suitable for three-phase motor start control

Technical Specifications

• Article Number: 3RP2576-1NW30
• Series: SIRIUS 3RP25 timing relays
• Function: Star-delta (wye-delta) time relay
• Supply Voltage: 12 … 240 V AC/DC, 50/60 Hz
• Time Delay Range: 3 … 60 s (adjustable)
• Contacts: 2 × NO — 1 delayed, 1 instantaneous
• Thermal Current (Ie): 5 A
• Rated insulation voltage / pollution degree: 300 V / pollution degree 3
• Surge Voltage Withstand: 4,000 V
• Mechanical Service Life: ~10,000,000 switching cycles
• Electrical Endurance: ~100,000 cycles (AC-15 / 230 V)
• Mounting Width: 22.5 mm
• Mounting Type: DIN-rail (35 mm rail) or flat mounting with optional lugs
• Ambient Operating Temperature: –25 °C … +60 °C
• Protection Class (front): IP20 — for internal control-cabinet use
• Connection Terminals: Screw-type, for conductors ~0.5–2.5 mm²

Applications

The 3RP2576-1NW30 is used in motor-control circuits requiring star-to-delta starting sequences to reduce inrush current at motor start-up. Typical applications include three-phase motor starters for pumps, compressors, fans, conveyors and other industrial machinery. It is suitable for installation in control cabinets, switchgear, automation panels — especially where space is limited but reliable time-based switching is required.