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Media gallery
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Media gallery
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Media gallery
Automatic star-delta switch / star-delta time relay
- Regular price
- €28,00 €23,14 excl. VAT
- Regular price
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- Sale price
- €28,00 €23,14 excl. VAT
- Unit price
- per
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- Description
- Instructions
- Payment methods
- Warranty
Relays for Star-Delta Trigger Modes (ERV-YU)
The ERV-YU starting relay is designed for automatic starting control of electric motors in STAR-DELTA mode at an operating voltage of 24/220 V AC. The relay provides smooth motor start-up, reduces starting current, and extends the lifespan of the entire drive system. It is equipped with light indicators for ON, STAR, and DELTA modes and allows setting the start time.
Description and operating principle
To ensure a smooth start of the electric motor, the STAR mode is activated first, which reduces the initial current surge. Once the desired speed is reached, the winding automatically switches to DELTA mode, where the motor continues to operate normally.
Automatic mode switching with relays and contactors increases the stability of the entire system and eliminates risks associated with manual operation.
When voltage is applied to the A1-A2 terminals of the relay:
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the STAR contact is activated, the STAR indicator lights up, and the start interval t1 (0.1-30 s) begins to count.
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After time t1 has elapsed, the STAR contact is disconnected, the indicator goes out, and a short pause t2 (15 ms) begins.
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Then the PHASE-DELTA contacts are switched on, the DELTA indicator lights up, and the relay remains in this mode as long as voltage is supplied to the A1-A2 terminals.
Application
The ERV-YU relay is suitable for:
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automatic motor switching control in star-delta mode
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industrial applications with high requirements for stable and reliable motor starting.
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systems where it is necessary to reduce the starting current and protect the electrical network.
Additional range
For this relay, you can purchase:
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contactors and starters
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contactors with mechanical interlock
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separate mechanical interlock modules
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metal enclosures with IP65 protection
All this is available directly from stock at competitive prices.
Online payment by bank card – after placing the order, you will be redirected to the payment portal. You will receive payment confirmation in your email.
Cash payment upon delivery – you will pay the amount specified in the payment notice to the courier upon delivery.
Payment by bank transfer – a prepayment invoice (proforma) will be sent to your email address no later than the next business day, indicating the bank account number to which the payment should be made.
Payment by invoice – this option is available to cooperation partners who have a cooperation agreement with our company.
If you wish to use one of the last two payment methods, please contact our customer service specialist, who will provide instructions on receiving an invoice with or without VAT.
The electrical equipment we supply meets high-quality standards, comes with a 24-month warranty, and fully complies with all European Union requirements.
We also offer free delivery for orders over 100 EUR, as well as a flexible discount and promotion system. Our employees' technical knowledge and experience allow us to provide professional consultations and, if necessary, offer alternative electrical product solutions.
