• Control Gear
• Tranilamp Pushbuttons / Indicators
• 22mm LED Pilot Lamps
• Kraus & Naimer Isolators
• Tranilamp Transformers
• Transformer Special Offers
• Timers / Relays
• Carlo Gavazzi relays
• Thyristor Controllers
• Stainless Steel Isolators
• Relays and Relay Bases
• ABB Emergency Stop Button
• Selector switches illuminated
• ABB Power Supplies
• Energy Meter
• Relpol Relays

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Analogue Controlled Thyristor Controllers

• AC Solid state relay, 1 and 2 pole.
• Analogue switching for resistive loads.
• 4-20mA or 0-10V control.
• Rated operational voltage up to 480V.
• LED Indication for normal operation and alarm status.
• IP20 Protection (finger-proof).
• DIN rail mountable.
• All types CE marked.

What is a Thyristor Controller?

Conventional burst-firing control of heater loads results in fairly large temperature swings in both the heater itself and the thyristor junction switching it.  Full-cycle control is a method of distributing energy to heaters evenly and at the same time keeping the thyristor junction  temperature at a reasonable level.

The Carlo Gavazzi thyristors are designed to eliminate the problems of interfacing BMS (Building Management System) or other analogue output controllers to solid state relays (Thyristors) in heating applications.  The innovative A/D input circuitry enables full-cycle control of the heater load with linear transfer.

Acceptable control inputs are 4-20mA (RN.F.I) or 0-10Vdc (RN.F.V). The voltage-controlled versions require a 24VAC/DC auxiliary supply whilst current controlled versions require no external supply, being loop-powered.

The benefits over conventional systems include:

• Easy installation 
• Reduced wiring
• Lower cost
• Space saving
• Reduced electromagnetic emissions.

To ease ordering and installation even further this series is available in both 1 pole and 2 pole versions.  The 1 pole version has been overhauled and is now the RJ1P series as below.  The benefits of the new series includes:

• Built in varistor for load over voltage protection
• Higher operational voltage range - greater flexibility
• Higher non-rep peak voltage - further protection against transient and voltage spikes (prevent false triggering)
• Higher dv / dt - better with inductive loads - prevents false operation of SSR
• The 50A version is only 45mm wide against 90mm for the RN1F
• Lighter in weight
• Microprocessor controlled - more linear, better resolution and can be modified for specific applications