PTC probe relay TeSys - LT3 with manual reset - 24 V - 1 NO + 1 NC

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TeSys LT3 thermistor protection unit for use with PTC probes, with manual reset and fault indicator on front, dual voltage supply 24 or 48V AC 50/60Hz. To be used with a combination of PTC probes impedance lower than 1500 Ohm at 25°C, the trip impedance zone is 2700-3100 Ohm, the manual reset is possible only if impedance has decreased enough to be below 1500-1650 Ohm. It provides 2 auxiliary contacts 1NO+1NC for fault signalling, 1 pushbutton on front face for a local manual reset, and 1 logic input for connection of a remote reset button. DIN rail mounting, connections by cage terminals. PTC thermistor probes DA1TT, DA1TS available (to be ordered separately). Multi standards certified (IEC, UL, CSA), Green Premium compliant (RoHS/REACh).

Product Details

[uc] Control Circuit Voltage 24...48 V AC 50/60 Hz
[ue] Rated Operational Voltage 250 V AC 50/60 Hz for output control relay
[ui] Rated Insulation Voltage output control relay: 500 V AC
[uimp] Rated Impulse Withstand Voltage 2.5 kV
Ambient Air Temperature for Operation -25-60 °C
Ambient Air Temperature for Storage -40-85 °C conforming to IEC 60068-2-1
Breaking Capacity 2 A at 24 V DC DC-13
Compatibility Code LT3SE
Condition of Use connection of probes 1000 m >2.5 mm²
Contacts Type and Composition 1 NC + 1 NO single voltage
Control Type manual reset
Depth 100 mm
Device Short Name LT3SE
Electromagnetic Compatibility resistance to electrostatic discharge level 3 conforming to IEC 61000-4-2
Height 100 mm
Input Voltage < 2.5 V (1500 Ohm) for probe
Ip Degree of Protection IP20 conforming to IEC 60529
Net Weight 0.22 kg
Product or Component Type thermistor protection units
Range of Product LT3
Standards IEC 60947-8
Tightening Torque 0.8 N.m
Width 22.5 mm
Connections - Terminals power circuit: cage type connector 1 cable(s) 0.75-2.5 mm²flexible with cable end
[ith] Conventional Free Air Thermal Current 5 A for output control relay
Control Circuit Voltage Limits 0.85...1.1 Uc
Hold-in Power Consumption in Va 2.5-2.5 VA
Maximum Short Circuit Detection Resistance 20 Ohm
Number of Probes 0-6
Operating Altitude <= 1500 m without derating in temperature
Probe Interchangeability label mark A conforming to IEC 60034-11
Rated Power in Va 100 VA at 220 V - electrical durability: 500000 cycles
Reset manual
Resistance 1500-1650 Ohm reset
Shock Resistance 5 gn 11 ms conforming to IEC 60068-2-27
Signalling Function fault indication
Vibration Resistance 1 gn 25...150 Hz conforming to IEC 60068-2-6

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