ТР440 Термални релеј
  • ТР440 Термални релеј

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Произвођач: ZIEHL

ТР440 Термални релеј

Product description

Temperature relay to protect transformers against excess temperature and to control a fan. The temperatures in the windings are monitored with three Pt 100 sensors. The core temperature can be monitored with a fourth sensor.
The 4 alarms/output relays are used to control the fan, to signal an advance warning and to switch-off the transformer. Various programs facilitate using the alarm ideally for each application. Depending on the program, e.g. an extra relay is available for the fault message or for triggering due to exceeding the maximum core temperature.

Other uses

Alternatively, with the fourth sensor the temperature of the room the transformer is located in can be monitored and, with the alarm, the room ventilation can be controlled. The device can also be used for other tasks for temperature monitoring e.g., for motors.

Overview of the functions

  • 4 Sensor inputs Pt 100 (RTD), 2 or 3-wire connection
  • Large monitoring range -199…+850°C / -199...+999°F
  • 4 Alarms / Relays
  • 3-digit digital display (resolution 1°C / 1°F)
  • 4 LEDs sensor
  • 4 LEDs relay
  • 4 LEDs alarm
  • 1 LED error
  • Control voltage AC/DC 24-240 V
  • Clear displays and simple programming
  • Min and max sensor values can be saved
  • Code lock against unintended / unauthorised changes to the settings
  • Optional RS 485 interface with Modbus RTU protocol
  • EasySimulation for simple sensor value simulation

Part number

T224184 no interface RS485
T224185 Interface RS485


Technical Data

Control voltage Us AC/DC 24 – 240 V, 0/50/60 Hz, <2 W < 4 VA
Limits DC 20.4 - 297 V
AC 20 - 264 V
Sensor connection Pt 100 according to EN 60751 (2/3-wire version)
Measuring range -199°C. 850°C / -199°F .. 999°F
Sensor resistance + line res. max. 500 Ohm
Sensor current ≤ 0.7 mA
Measurement cycle/measurement time <2,5 s
Tolerance ± 1°C, ± 1 Digit
Temperature drift <0.04°C/K
Relay data K2, K3 and K4 3 x 1 change-over contact
Switching voltage max. AC 415 V
Switching current max. 6 A
Switching capacity max. 2000 VA (Ohmic load)
max. 120 W at DC 24 V
Nominal operating current for reversing switch 3 A AC15 250 V; 2 A DC13 24 V
Recommended series fuse 3.15 A slow-to-blow ( gL )
Contact service life, mechanical 3 x 107 operating cycles
Contact service life, electrical 1 x 105 operating cycles at 240 V / 6 A
Reduction factor at cos ϕ 0,3 0,5


Relay data K1

  1 reversing switch
Switching voltage max. AC 400 V
Conventional thermal current Ith max. 10 A
Inrush current (at 10 % ED) 30 A max. 4 s
Nominal operating current Ie (AC 15) 6 A AC 250 V
Recommended series fuse gG/gL 10 A
Contact service life, mechanical 30 x 106 operating cycles
Contact service life, electrical 1 x 106 operating cycles at AC 250 V / 6 A
2 x 105 operating cycles at AC 250 V / 10A cos ϕ 0,6


Test conditions (EN 50178 / EN 61010-1)

Rated impulse withstand voltage 4000 V
Pollution level 3
Rated insulation voltage Ui 250 V
Operating time 100%
Permissible ambient temperature -40 °C ... +65 °C
EN 60068-2-2 dry heat
EMC compatibility EN 61000-6-2
EMC electrical interference EN 61000-6-3
Vibration resistance EN 60068-2-6 2…25 Hz ±1.6 mm
25 ... 150 Hz5 g
Galvanic insulation Us – relays, sensors, (RS 485) ..... DC 3820 V
relays – sensors, (RS 485) ..... DC 3820 V
No Galvanic insulation (Only devices with RS 485 interface) RS 485 – sensors


Housing (Panel monitoring housing SE 2)

Dimensions (W x H x D) 96 x 96 x 80 mm
Line connection single strand na 1 x 2,5 mm2
Finely stranded with wire end sleeve na 1 x 2,5 mm2
Housing internal protection Front panel IP 54 (with seal), rear IP 20
Terminal strip protection type IP 20
Mounting Panel mounting, Cut-out 91+0.7 x 91+0.7 mm
Weight app. 310 g
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Product description

Temperature relay to protect transformers against excess temperature and to control a fan. The temperatures in the windings are monitored with three Pt 100 sensors. The core temperature can be monitored with a fourth sensor.
The 4 alarms/output relays are used to control the fan, to signal an advance warning and to switch-off the transformer. Various programs facilitate using the alarm ideally for each application. Depending on the program, e.g. an extra relay is available for the fault message or for triggering due to exceeding the maximum core temperature.

Other uses

Alternatively, with the fourth sensor the temperature of the room the transformer is located in can be monitored and, with the alarm, the room ventilation can be controlled. The device can also be used for other tasks for temperature monitoring e.g., for motors.

Overview of the functions

  • 4 Sensor inputs Pt 100 (RTD), 2 or 3-wire connection
  • Large monitoring range -199…+850°C / -199...+999°F
  • 4 Alarms / Relays
  • 3-digit digital display (resolution 1°C / 1°F)
  • 4 LEDs sensor
  • 4 LEDs relay
  • 4 LEDs alarm
  • 1 LED error
  • Control voltage AC/DC 24-240 V
  • Clear displays and simple programming
  • Min and max sensor values can be saved
  • Code lock against unintended / unauthorised changes to the settings
  • Optional RS 485 interface with Modbus RTU protocol
  • EasySimulation for simple sensor value simulation

Part number

T224184 no interface RS485
T224185 Interface RS485


Technical Data

Control voltage Us AC/DC 24 – 240 V, 0/50/60 Hz, <2 W < 4 VA
Limits DC 20.4 - 297 V
AC 20 - 264 V
Sensor connection Pt 100 according to EN 60751 (2/3-wire version)
Measuring range -199°C. 850°C / -199°F .. 999°F
Sensor resistance + line res. max. 500 Ohm
Sensor current ≤ 0.7 mA
Measurement cycle/measurement time <2,5 s
Tolerance ± 1°C, ± 1 Digit
Temperature drift <0.04°C/K
Relay data K2, K3 and K4 3 x 1 change-over contact
Switching voltage max. AC 415 V
Switching current max. 6 A
Switching capacity max. 2000 VA (Ohmic load)
max. 120 W at DC 24 V
Nominal operating current for reversing switch 3 A AC15 250 V; 2 A DC13 24 V
Recommended series fuse 3.15 A slow-to-blow ( gL )
Contact service life, mechanical 3 x 107 operating cycles
Contact service life, electrical 1 x 105 operating cycles at 240 V / 6 A
Reduction factor at cos ϕ 0,3 0,5


Relay data K1

  1 reversing switch
Switching voltage max. AC 400 V
Conventional thermal current Ith max. 10 A
Inrush current (at 10 % ED) 30 A max. 4 s
Nominal operating current Ie (AC 15) 6 A AC 250 V
Recommended series fuse gG/gL 10 A
Contact service life, mechanical 30 x 106 operating cycles
Contact service life, electrical 1 x 106 operating cycles at AC 250 V / 6 A
2 x 105 operating cycles at AC 250 V / 10A cos ϕ 0,6


Test conditions (EN 50178 / EN 61010-1)

Rated impulse withstand voltage 4000 V
Pollution level 3
Rated insulation voltage Ui 250 V
Operating time 100%
Permissible ambient temperature -40 °C ... +65 °C
EN 60068-2-2 dry heat
EMC compatibility EN 61000-6-2
EMC electrical interference EN 61000-6-3
Vibration resistance EN 60068-2-6 2…25 Hz ±1.6 mm
25 ... 150 Hz5 g
Galvanic insulation Us – relays, sensors, (RS 485) ..... DC 3820 V
relays – sensors, (RS 485) ..... DC 3820 V
No Galvanic insulation (Only devices with RS 485 interface) RS 485 – sensors


Housing (Panel monitoring housing SE 2)

Dimensions (W x H x D) 96 x 96 x 80 mm
Line connection single strand na 1 x 2,5 mm2
Finely stranded with wire end sleeve na 1 x 2,5 mm2
Housing internal protection Front panel IP 54 (with seal), rear IP 20
Terminal strip protection type IP 20
Mounting Panel mounting, Cut-out 91+0.7 x 91+0.7 mm
Weight app. 310 g
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