Temperature-Relay Type TR250
3 Sensors Pt 100 (RTD), Pt 1000, PTC or KTY, 3 Limits
Product description
Thermostats TR 250 monitor up to 3 sensors at the same time. Output-relays and sensors can be associated freely. Basic settings like monitoring 3 sensors for the same switching point with common alarm (e.g. for monitoring motors or transformers) are preset.
Applications
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Protection of motors or generators against overload, also with simultaneous monitoring of temperatures in bearings
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Protection of dry transformers against overload, also with control of a forced cooling
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General protection of motors and machines against over-temperatures
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Temperature-controller, also for refrigerating systems
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Monitoring of differences in temperature
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Resolution 0.1 °C for measuring range –19.9...99.9 selectable
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alternative to foreign product type TS-02
Function Overview
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3 sensor-inputs, Pt 100 (RTD) or Pt 1000 in 2- or 3-wire-connection
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KTY 83, -84, PTC (thermistors)
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3 relay-outputs (1 change-over-contact each)
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universal power-supply AC/DC 24-240 V
Displays
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Built-in 3 digit display for temperature
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3 LEDs Alarm (state of relays)
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3 LEDs Sensor
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Stored Values of MIN- and MAXtemperature can be displayed
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Programmin
Switching functions:
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3 relays
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warmest/coldest sensor switches relay
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3 LEDs for alarm/relay
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programmable for every relay:
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hysteresis
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autoreset or electric reclosing lock
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delay time for switching and switching back
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operating- or closed current-mode
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cyclic check of function
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monitoring of difference in temperature
6 preset programs:
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Motor /generator 3x Pt 100
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transformer with 3x Pt 100
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transformer with 2x PTC and 1x Pt 100
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transformer with 2x PTC / 3x PTC
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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
Relay output
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 mech. ....... 3 x 107 operations
Expected contact life electrical ....... 1 x 105 operations with AC 250 V / 6 A
Test conditions (EN 61010-1)
Rated impulse voltage ....... 4000 V
Overvoltage category ....... III
Contamination level ....... 2
Rated insulation voltage Ui ....... 300 V
On-time ....... 100 %
EMC-tests (EN 61326-1)
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
Environmental conditions
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 ...... <2,5 s (depending on number and
type of connected sensors)
Housing (type V 4)
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 ....... approx. 200g
For requested more information