Single Phase Thyristor Power Switch for Duct Heaters – POW-1-ZC
₹4,450 – ₹6,950
Prices are inclusive of Delivery Charges.
POW-1-ZC – Single Phase Zero Cross Over Pulse Width Modulated SCR Power Switch.
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Libratherm offers a single-phase heater power regulator model POW-1-ZC-XX for electric power control of resistive heating loads operating on single-phase 230VAC. This regulator accepts the user-selectable DC control signal of 0-10V and 4-20mA and can be easily interfaced with BMS, DDC, PID, or PLC. An external potentiometer can also be used for manual control. The On-Off duty cycle of voltage across the heaters can gradually vary proportional to the control signal. For a preset cycle time of 4 seconds, 50% power will be delivered by keeping the heater ON for 2 seconds and OFF for 2 seconds.
The facility is also provided to protect against the regulator’s overheating. Under normal conditions, the built-in thermostat switch will remain closed and will open when the device or heat sink temperature crosses around 90oC. The user can connect an external alarm relay to the interlock. Under normal conditions, the external relay will remain energized, and in case of overtemperature, the relay will de-energize.
Auto control is done through an external signal of 0-10V, and manual control is done using an on-card preset that is user-selectable using a jumper link.
This model POW-1-ZC-XX is available in a rugged powder-coated metal enclosure and can be easily fitted inside the panel. The terminal connection diagram and other settings on the top surface are lasers marked to facilitate the user for the wiring and operation of POW-1-ZC-XX.
Key Features:
- Solid-state, field-proven, rugged and reliable design.
- Operates on 24VAC/DC
- Control signal 4-20mA/0-10V (Factory set to 0-10V)
- Zero cross-over Burst fire switching control
- PWM in proportion to the control signal
- Adjustable ON-OFF duty cycle time
- LED indications for Power ON, Input Command and Over temperature of the heatsink.
- Built-in thermostat for Auto-Reset Over-Temperature protection
- Designed for single-phase heater load 2 to 10KW @ 220VAC-280VAC
Applications:
- Air Heater power control in AHU duct
- Power control of Resistive heaters used in Industrial Applications
Technical Specification
| Parameters | Description |
|---|---|
| Item | Single Phase Thyristor based heater power regulator |
| Model | POW-1-ZC-XX (XX = 10A, 20A,30A,40A,50A) |
| Control Signal Input (Linear) | 0-10V, 4-20mA – user selectable through a DIP switch or an external 10K potentiometer. (Factory set to 0-10V). |
| Control Technique | Zero Cross Over Burst Firing control |
| PWM Cycle Time | 2 to 20 seconds – adjustable (Factory set to 4 seconds) |
| Aux. Supply Voltage | 24VAC/DC +/-10% @ max 10watt. |
| Heater Supply | Single Phase (220-280) VAC @ 50/60Hz |
| Max. Load Current | 20A,30A,40A,50A @ 220VAC - 280VAC (As per the model specified in the above table) |
| Auto/Manual Control | On-card jumper selectable. The heater output voltage is scalable using the SCALE on-card single-turn preset. |
| Over Temperature Protection | A 90°C thermostat (NC type) is mounted on a heatsink. If the heatsink temperature exceeds 90°C, the heater is turned off. |
| Alarm Output | 24VAC/DC supply point is available at the terminal in series with the NC contact of the Thermostat. |
| LED Indication | LEDs for Power ON, Heater ON and Over Temperature |
| Mounting | Base plate mounting using 4 x M4 screws. |
| Connections | 6xTerminal connectors for Auxiliary Supply and Control Signal, 4x30A/50A terminal connectors for Heater Supply and Heater Load. |
| Dimensions | As given in the above table. |
| CE Certification | Low Voltage Directives - 2014/35/EU and EMC Directives - 2014/30/EU |
Ordering Information
| Model | Product Description | Size (W x H x D) (mm) | Part No. |
|---|---|---|---|
| POW-1-ZC-10A | Single Phase Heater power regulator for max. 2KW @220VAC-280VAC | 120 x 125 x 65 | 2702 |
| POW-1-ZC-20A | Single Phase Heater power regulator for max. 4KW @220VAC -280VAC | 120 x 125 x 65 | 2703 |
| POW-1-ZC-30A | Single Phase Heater power regulator for max. 6KW @220VAC – 280VAC | 130 x 125 x 85 | 2704 |
| POW-1-ZC-40A | Single Phase Heater power regulator for max. 8KW @220VAC-280VAC | 130 x 175 x 85 | 2705 |
| POW-1-ZC-50A | Single Phase Heater power regulator for max. 10KW @220VAC – 280VAC | 130 x 200 x 85 | 2706 |
