w-automat type star-delta relay

The ERV-YU is a star-delta starting relay designed for the automatic control of three-phase motor starting. It reduces starting current and protects the installation by switching between star and delta configurations in a timed manner.
This device starts operating by activating the contactor in star mode for the configured time. After this period, it performs a brief transition pause and automatically switches to delta mode, ensuring a smooth and efficient motor start.
Thanks to its configurable time setting and compact DIN rail design, the ERV-YU is a reliable and easy-to-integrate solution for industrial electrical panels.

Main features

• Star-delta relay for starting three-phase motors
• Reduction of starting current
• Automatic star → delta switching
• Adjustable star run time
• Integrated transition time (15 ms)
• LED status indicators (star/triangle)
• Compact design for DIN rail mounting
• Easy installation and reliable operation

Technical specifications

• Supply voltage:
  • 150–260 V AC
  • 24 V AC/DC (additional input)
• Frequency: 50/60 Hz
• Time on star: 0.1 s – 30 s
• Transition time: 15 ms
• Power consumption: < 6 VA
• Relay output: 5A / 250V AC (resistive load)
• Operating temperature: -20°C to +55°C
• Mounting: DIN rail
• Connection: Terminal
• Weight: < 80 g

Applications

• Starting three-phase motors
• Industrial systems
• Pumps and compressors
• Electrical machinery
• Motor automation

The ERV-YU is an essential solution for the safe and efficient starting of three-phase motors, optimizing performance and reducing the electrical impact on the installation.