ETR-Sa

ETR-Sa – Product Description

• The ETR-Sa is a Star-Delta Timer designed for controlling motor starting sequences.

• Provides an extended star timing range compared to the standard ETR-S model.

• Compact 17.5 mm DIN-rail mounted design with LED timing indication.

• Built with finger-guard protection and robust construction for industrial use.

Key Specifications

• Function: Star-Delta timing control with adjustable star time and fixed transfer delay.

• Star Time Range: 12 seconds to 120 seconds.

• Transfer Delay: 100 milliseconds between star deactivation and delta activation.

• Output Contacts: Two change-over (C-NO) relays – one for star and one for delta.

• Supply Voltage: Available in standard 240 VAC; X-Version supports 24 VAC to 240 VAC and 24 VDC to 220 VDC.

• Power Consumption: Low, in line with compact analog timer designs.

• Terminals: Screw-type with self-lifting clamps.

• Mechanical Life: ≥10 million operations (no load).

• Electrical Life: ≥1800 operations/hour (at full load).

• Insulation Resistance: >100 MΩ at 500 V DC.

• Dielectric Strength: 1.5 kV AC between input, relay, enclosure; 1.0 kV AC across non-continuous relay contacts.

• Dimensions: 17.5 mm (W) × 89 mm (H) × 62 mm (D).

Applications

• Star-delta motor starting to reduce inrush current.

• Motor Control Centers (MCC).

• High-tension (HT) and low-tension (LT) panels.

• Control & Relay (C & R) panels.

• Relay Timing Control Centers (RTCC).

• Transformer control panels.

• Industrial automation systems where extended star timing is required.

Summary

• The ETR-Sa is a compact star-delta timer with extended star timing (12–120 s).

• Ensures smooth motor starting with a fixed 100 ms transfer delay.

• Features dual relay outputs and wide supply voltage compatibility.

• Reliable, long-life design suitable for MCCs, HT/LT panels, RTCC, transformer and automation panels.