Three Phase Thyristor Power Switch for Duct
Heaters – POW-3-ZC (6KW to 21KW)
Three Phase Thyristor Power Switch for Duct Heaters – POW-3-ZC (6KW to 21KW)
Libratherm offers a three-phase heater power regulator model POW-3-ZC-2L-XXA for electric power control of resistive heating loads operating on three-phase 415VAC. This regulator accepts the user-selectable DC control signal of 0-5V, 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 proportionally to the input 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 normalconditions, 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 energised, and in case of overtemperature, the relay will de-energise.
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.
These POW-3-ZC-2L-XXA models are available in a rugged powder-coated metallic enclosure with an extruded aluminium heat sink and can be easily fitted inside the panel.
Key Features:
- Solid-state, field-proven, rugged and reliable design.
- Operates on 24VAC/DC
- Control signal 4-20mA/0-5V/0-10V/Potentiometer (Factory set to 0-10V)
- Three phase two leg – zero cross-over Burst fire switching control
- LED indications for Power ON, Input Command and Over temperature of the heatsink.
- Built-in thermostat for Auto-Reset Over-Temperature protection
- Designed for three-phase heater load of 6KW to 25KW@ 415VAC
Applications:
- Air Heater power control in AHU duct
- Power control of Resistive heater used in Industrial Applications
| Parameters | Description |
|---|---|
| Item | Three Phase 2 Leg Control Thyristor-based heater power regulator |
| Model | POW-3-ZC-2L-XXA (As specified in the above table) |
| Control Signal Input (Linear) | 0-5V, 0-10V, 4-20mA or using an external 10K potentiometer. (Factory set to 0-10V) |
| Aux. Supply Voltage | 24VAC/DC +/-10% @ max 10watt. |
| Heater Supply Voltage | 380 to 480VAC three phase @ 50/60Hz |
| Max. Load Current | 10A to 30A @ 380 to 480VAC (As per the model specified in the above table) |
| Auto/Manual Control | The on-card jumper is selectable. The heater output voltage is scalable using the SCALE on-card single-turn preset. |
| Over Temperature Protection | A thermostat of 90oC is mounted on a heatsink. (NC type). |
| Alarm Output | 24VAC/DC supply point is available at the terminal in series with the NC contact of the Thermostat. |
| Mounting | Base plate mounting using four screws. |
| Connections | 5A Terminal PCB connectors for Auxiliary Supply and control signal, heavy-duty Terminal PCB connectors for Heater Supply and Heater load. |
| Cooling | Natural Air cooling |
| Dimensions | As given in the Ordering Information table. |
| CE Certification | Low Voltage Directives - 2014/35/EU and EMC Directives – 2014/30/EU |
| Model | Description | Size (W x H x D) mm | Part No. |
|---|---|---|---|
| POW-3-ZC-2L-10A | Three Phase Heater power regulators for 6KW@380-480VAC (10A max) | 130 x 155 x 75 | 2751 |
| POW-3-ZC-2L-15A | Three Phase Heater power regulators for 9KW@380-480VAC (15A max) | 130 x 175 x 75 | 2752 |
| POW-3-ZC-2L-18A | Three Phase Heater power regulators for 12KW@380-480VAC (18A max) | 130 x 185 x 75 | 2753 |
| POW-3-ZC-2L-21A | Three Phase Heater power regulators for 15KW@380-480VAC (21A max) | 130 x 195 x 75 | 2754 |
| POW-3-ZC-2L-25A | Three Phase Heater power regulators for 18KW@380-480VAC (25A max) | 130 x 205 x 85 | 2755 |
| POW-3-ZC-2L-30A | Three Phase Heater power regulators for 21KW@380-480VAC (30A max) | 130 x 215 x 85 | 2756 |
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