THERMAL RELAY TR250.
  • THERMAL RELAY TR250.

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Gamintojas: ZIEHL

THERMAL RELAY TR250.

The Pt100 thermostat TR250 monitors up to 3 sensors Pt100 (RTD), Pt1000, KTY83 KTY84 or thermistors (PTC) at the same time. Different types of sensors, e.g. Pt 100 and PTC can be monitored simultaneously. The unit is especially suitable for monitoring motors, generators and transformers.

An other application is the use as a 2- or 3-step-controller with additional monitoring of over- or under-temperature. monitoring of differences in temperatures of 2 sensors or temperature controller for heat pumps.

Function

  • Measuring an dmonitoring range -199...+850 °C
  • Resolution 0.1 °C for measuring range –19.9...99.9 selectable
  • 3 relay-outputs K1 to K3 with change-over-contacts
  • Universal power-supply AC/DC 24-240 V
  • Easy setting
  • Storing of values of MIN- and MAX temperature
  • Alarm counter for 3x99 alarms with display of sensor and elapsed time
  • Code-lock against manipulation of settings

3 Sensor inputs:

  • Pt 100 (RTD) or Pt 1000, 2- or 3-wire-connection, KTY83, KTY84
  • Thermistors (PTC) each 1...6 in series
  • Monitoring of short-circuit and break

Displays:

  • 3 digit 7 segment display for temperature and programming
  • 3 LEDs for sensors, for alarms/relays
  • display °C or °F selectable, resolution 0.1 °C

Switching functions:

  • 3 relays
  • warmest/coldest sensor switches relay
  • 3 LEDs for alarm/relay
  • programmable for every relay:
    • hysteresis
    • autoreset or electronic reclosing lock
    • delay time for switching and switching back
    • operating- or closed current-mode
    • cyclic check of function
  • monitoring of difference in temperature

6 preset programs:

  • Motor /generator 3x Pt 100
  • transformer with 3x Pt 100
  • transformer with 2x PTC and 1x Pt 100
  • transformer with 2x PTC / 3x PTC
  • 3 x 1 alarm per sensor

Technical Data

Rated supply voltage Us AC/DC 24 – 240 V
Tolerance DC 20, 4 - 297 V ..... AC 20 - 264 V 50/60 Hz
Power consumption < 3 W ..... < 7 VA
Output 3 x co (change-over)
Switching voltage max. AC 415 V
Switching current max. 5 A
Switching power max. 1250 VA (resistive load)
max. 120 W at DC 24 V
UL electrical ratings 250 V ac, 5 A, resistive
E214025 240 V ac, 1/2 hp
120 V ac, ¼ hp
B 300 – pilot duty, UL 508
Rated operational current Ie  
AC15 Ie = 3 A ..... Ue = 250 V
DC13 Ie = 2 A ..... Ue = 24 V
Ie = 0,2 A ..... Ue = 125 V
Ie = 0,1 A ..... Ue = 250 V
Recommended fuse for contacts T 3,15 A (gL)
Expected contact life mechanical 3 x 107 operations
Expected contact life electrical 1 x 105 operations with AC 250 V / 6 A
Rated impulse voltage 4000 V
Overvoltage category III
Contamination level 2
Rated insulation voltage Ui 300 V
On-time 100 %
emitted interference EN 61000-6-3
Burst EN 61000-4-4 +/-4 kV
Pulse 5/50 ns, f = 5 kHz, t = 15 ms, T = 300 ms
SURGE IEC 61000-4-5 +/-4 kV
Impulse 1,2/50 μs (8/20 μs)
discharge of static electricity IEC 61000-4-2 +/-4 kV contact, +/- 8kV air
Ambient temperature range -20 °C ... +65 °C
Storage temperature range -20 °C … +70 °C
Altitude Up to 2000 m
Climatic conditions 5 – 85 % rel. humidity, no condensation
External wiring temperature range -5 °C … +70 °C
Vibration resistance EN 60068-2-6 2…25 Hz ±1,6 mm
25 ... 150 Hz 5 g
Accuracy ±0,5 % of value ±1 K (KTY ±5 K)
Sensor-current ≤ 1 mA
Measuring time tM  
Mounting height 55 mm
Width 4 TE
Dimensions (W x H x D) 70 x 90 x 58 mm
Line connection solid wire each 1 x 1,5 mm2
Stranded wire with insulated ferrules each 1 x 1,0 mm2
Torque 0.5 Nm (3,6 lb.in)
Protection class housing IP 30
Protection class terminals IP 20
Fitting position any
Mounting Snap mounting on 35 mm standard rail EN 60 715 or M4 screws
Weight app. 200g

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