STAR DELTA TIMER RELAY GRT8-ST

Product Description

The GRT8-ST is a Star-Delta Timer Relay designed for automatic control of star-delta motor starters. It provides precise timing between the star and delta switching stages, helping to reduce motor starting current and mechanical stress during startup.

This timer is widely used in industrial motor control panels, pumps, compressors, fans, conveyors, and machinery that utilise star-delta starting methods for three-phase motors.

Key Features

• Dedicated star-delta timer relay for motor starters
• Automatic changeover from star to delta operation
• Adjustable start time setting for flexible motor startup
• Precise timing control with high repeatability
• Reduces motor starting current and mechanical stress
• Separate star and delta relay outputs
• LED indication for power and output status
• Compact DIN rail mounting design
• Wide supply voltage compatibility
• Reliable electronic timing circuitry
• Easy front-panel adjustment
• Suitable for industrial automation and motor control panels

Specifications

• Product Type: Star-Delta Timer Relay
• Model: GRT8-ST
• Function: Automatic Star-Delta Switching Timer
• Supply Voltage: 24V DC / 24–240V AC/DC (variant dependent)
• Frequency: 50/60 Hz
• Time Setting Range: Adjustable from 0.1 seconds to 100 hours (range dependent)
• Output Contacts: 2 Changeover (DPDT) relay contacts
• Contact Rating: 8A at 250V AC
• Timing Accuracy: ±0.2% setting value
• Repeat Accuracy: ±0.5%
• Mounting Type: 35 mm DIN rail
• Status Indication: LED indicators for power, star, and delta outputs
• Protection Class: IP20
• Operating Temperature: -20°C to +55°C
• Housing Width: 17.5 mm modular design
• Application: Star-delta motor starters, pumps, compressors, blowers, conveyors, industrial machinery, HVAC systems