ETR-S

ETR-S – Product Description

• The ETR-S is a Star-Delta Timer in the slim 17.5 mm ETR series by EAPL.

• Designed to automate the transition from star to delta configuration in motor starting applications: energizes a star relay first, then switches to delta after a preset delay (transfer delay).

• Mounts neatly on DIN rail or panel with compact design, complete with LED timing indication and finger-guard protection for safety.

Key Specifications

• Function: Star-Delta timing control for seamless motor start sequence.

• Supply Voltage: Standard 240 VAC; available in wider ranges (e.g., 110–415 VAC).

• Time Range: Star timing from 6 s to 60 s, with fixed transfer delay of 100 ms between star and delta switching.

• Output Contacts:

  • 1 change-over (C-NO) contact for the star connection.

  • 1 change-over (C-NO) contact for the delta connection.

• Power Consumption: Typically in line with other ETR series units (compact analog designs); exact VA not specified.

• Transfer Delay (TD): 100 ms default (time between star relay de-energizing and delta relay energizing).

• Operating Conditions:

  • Ambient Temperature: from –10 °C to +55 °C.

  • Storage Temperature: –25 °C to +80 °C.

  • Humidity: Up to 95 % RH @ 40 °C.

• Service Life:

  • Mechanical: high durability — millions of operations expected under no load.

  • Electrical: reliable at high operation cycles under resistive loads.

• Insulation & Dielectric Strength:

  • Insulation resistance: over 100 MΩ at 500 V DC.

  • Capable of withstanding 1.5 kV AC between input, relay contacts, and enclosure, and 1.0 kV AC across non-continuous relay contacts.

• Connections & Physical:

  • Screw-type terminals with safety self-lifting clamps.

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

Applications

• Motor Control Panels where star-delta starting is used to reduce starting current.

• MCC (Motor Control Centers) to manage multiple motor start sequences efficiently.

• HT / LT Electrical Panels in industrial automation environments.

• Control & Relay (C & R) Panels to support motor sequencing logic.

• RTCC (Relay Timing Control Centers) and Transformer Panels, wherever timed switching between star and delta is required.

• General Automation Equipment where controlled motor start-up is essential for system reliability and reduced inrush.

Summary

• The ETR-S is a compact, reliable Star-Delta Timer engineered for precise motor starting.

• Configurable star time from 6 s to 60 s, with a consistent 100 ms transfer delay to ensure smooth transition to delta mode.

• Able to handle standard panel voltages, hardened for industrial environments, and packaged in a space-saving 17.5 mm DIN-rail form factor.

• Suitable for deployment across diverse electrical control systems including MCCs, automation panels, and relay control assemblies.