Hot Spot 3 Relay
 
Application :
  The Rishabh temperature trip relay has been designed to monitor three separate temperature zones in large electric motors, transformer windings or any temperature conscious equipment such as process lines, gas turbines or engine driven generating sets, using Resistance Temperature Detectors (RTDs). The highest of three temperatures is automatically selected and a 0 to 1 milliamp output signal produced. Yellow LEDs are fitted to show which of three sensors is at the highest temperature. The output signal is compared internally with the voltage from up to three set point potentiometers and the difference fed to trigger relay circuits. Red LEDs are used to indicate relay energised. Single pole changeover relays are provided for each set point. In a typical installation the three set points would be set to trip on increasing temperature, in the following sequence :-
  1. Sustained overload
  2. Single phasing
  3. Locked rotor
   
  Options :
  1. An extra 4 terminals can be fitted for remote indication.
  2. Relay energising at the set points (rising temperature)
   
  Protection Against :
  • Ineffective cooling
  • Blocked ventilation
  • Overloads
  • Worn bearings
     
  Specifications :
 
Input Up to 3 inputs, 2 or 3 wire RTD sensors either 10W Copper or 100W Platinum minimum
span 100°C
Auxiliary supply  
A.C. 110, 120, 220, 230, 240 V (specify)
+ 20% 50/60 Hz,
Burden 4 VA maximum
Weight Approximately 1.4Kg
Output Relay :
Relay differential Standard 2% of range
Type S.P. Changeover
Rating A.C 240V,5A non-inductive
  D.C
24V, 5A resistive
Operations 0.2 million at the above load
Reset Automatic
Standard De-energise at set point with rising temperature
Indicator O/P 1mA into 0/4kW load
 
  - Protector Trip Relays
  - A.C. Current Relay
  - A.C. Voltage Relay with adjustable differential
  - A.C. Voltage Relay with adjustable time delay
  - Frequency Relay
  - Combined Under / Over Voltage & Under / Over Frequency Relay
  - Phase Sequence & Phase Failure Relay
  - Phase Balance Relay
  - Reverse Power (Current) Relay
  - Synchro-Check Relay(Paralleling)
  - D.C. Voltage Relay
  - Thermistor Trip Relay
  - Hot Spot 3 Relay
  - Hot Spot 6 Relay
  - Millivolt / Thermocouple Relay
  - Transducer Trip
  - Speed Sensing Trip Relay
 
 
 
 
 
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