Transformer protection temperature relay TR440
Pt100 Temperature-Relay, protection of transformers, 4 Sensors Pt100, 4 Limits, Monitoring of core, fan control, Panel mount
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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
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
per 1 x 2.5 mm2
Finely stranded with wire end sleeve
per 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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