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

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Gefran GTT Power Solid State Relays for the industry

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.

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Gefran GTT

Gefran GTT

Power Solidstate Relay
with heatsink

Gefran GT: SSR, analogue

Gefran GT

Solidstate Relays
without heatsink
(replacement part for GTT)

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

 

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

Gefran GTT series current rating

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).

Ceramics Manufacturing
Glass Tempering
Melting of Metals
Semiconductor industry: Heat treatment of silicone plates


 

GTT Power SSRs complete with heatsinks

stock code current rating voltage rating trigger voltage size (mm)
LxWxH
Gefran GTT Power SSR - dimensions
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) Gefran GT Solid State Relay without heatsink
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

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

 

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