SSRs: Analogue Input (4 - 20mA/0 - 10V), Gefran GTT

Gefran GTT Power Solid State Relays

The compact GTT series of solid state relays with heatsink has been designed for very accurate control of rapidly changing process variables.

Typical applications are heating systems with low thermal inertia (air heaters, medium wave infrared emitters…). In contrast to conventional solid state relays which are activated by a logic signal, the GTT series is activated by an analog signal (0-10V or (0)4-20mA).

This results in a dynamically optimized time cycle which reduces the thermal flicker caused by pulsing of conventional SSRs.

Technical Information

Features dynamically optimized time cycle zero cross-over switching MOV varistor incorporated (transient suppression) analog control: 0-5/10VDC, 0/4—20mA or potentiometer 1K to 10K Installation notes horizontal distance between two GTT: >20mm horizontal distance between a GTT and panel wall: >100mm mount GTT vertically, allowing free convection of air over the heat sink. avoid obstruction close to heatsinks (eg.cable channels) allow ventilation of the panel or use an air conditioner observe the current derating curves for high panel temperature use suitably rated ultra-rapid fuses to protect against fault currents   View products!

Curves of rated current for GT series according to ambient temperature:

Solid State Relays

The GTT can be used in three-phase systems, using master-slave control architecture in which the control signal drives only one GTT (master) which then supplies the synchronizing signal to the other two units (slaves).

Whether a unit operates as master or slave depends merely on the way it is connected. A 24Vac 1.5VA power source is required. GTT consist of a DIN-rail mounting heatsink and a replaceable solid state relay (GT).

GTT Power SSRs complete with heatsinks

stock code	current rating	voltage rating	trigger voltage	size (mm) LxWxH
UCG-GTT025A-4800	25A	480Vac		108x60x132
UCG-GTT040A-4800	40A	480Vac	0--5VDC	108x60x132
UCG-GTT060A-4800	60A	480Vac	0--10VDC	108x82x152
UCG-GTT090A-4800	90A	480Vac	0/4--20mA	108x127x145
UCG-GTT120A-4800	120A	480Vac		108x127x145

GT Solidstate relays without heatsinks (replacement part for GTT)

stock code	current rating	voltage rating	trigger voltage	size (mm)
UCG-GT025A-4800	25A	480Vac	0--5VDC	100x60x34
UCG-GT040A-4800	40A	480Vac	0--10VDC	100x60x34
UCG-GT060A-4800	60A	480Vac	0/4--20mA	100x60x34
UCG-GT090A-4800	90A	480Vac		100x60x34
UCG-GT120A-4800	120A	480Vac		100x60x34

Note: current rated at 40°C working temperature. Refer to derating curves for higher temperatures

Three-phase star connection with neutral, optional monitoring of interrupted load

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