Introduction
Chapter 1 INTRODUCTION
The Eurotherm 451-455-461 thyristor unit range offer a vast number of possibilities which,
for the most part, meet the requirements of the low and medium power market. The current
range is from 15 A to 150 A for voltages of up to 660 V rms.
The range is divided into two main groups:
• Solid state contactors (451 series)
The thyristor units, driven by a logic signal, operating in ON/OFF mode with tiring of
the thyristors when the supply voltage changes to zero.
• Power units (455 and 461 series)
The thyristor units driven by an analogue signal emit an output signal proportional
to the thyristor firing angle and burst firing input signal, or a combination of both
signals.
Thyristor unit voltage selection
• Single-phase power supply from 100 to 240 V:
Nominal voltage of unit 240 V.
• Single-phase power supply from 380 to 415 V:
Nominal voltage of unit 440 V.
• Three-phase power supply, mounting 3 wires plus neutral:
Nominal voltage of unit: take into account the voltage between phase and neutral.
• Three-phase power supply, mounting 3 wires (star or delta) or
6 wires (open delta):
Nominal voltage of unit: take into account the voltage between phases.
451-461 User Manual
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