- Place of Origin: China (Mainland)
- Brand Name: CNSN
- Model Number: LT47
- Theory: Current Relay
- Usage: over current relay
- Size: Miniature
- Type: Electric Parameter Relay
Packaging & Delivery
|Delivery Detail:||10 Working days|
SpecificationsSatisfy machine protection requirements
Have definite time characteristics: Current threshold and time based function.
LR97 D and LT47 electronic over current relays have been developed to satisfy machine protection requirements.
These relays have definite time characteristics: Current threshold and time based function.
They are particularly recommended for providing mechanical protection on machines with high resistive torque, high
Inertia and with strong probability of jamming under steady state conditions.
They can be used for motor protection in the case of long starting times or frequent starting.
The LR97 D relay also incorporates two fixed time protection functions, one of 0.5 seconds against locked rotor and
One of 3 seconds against phase failure.
LR97 D and LT47 can be used to provide mechanical shock protection. In this case, setting the O-Time knob to
Minimum will ensure tripping in 0.3 seconds.
LR97 D and LT47 relays are particularly suitable for the following machines:
Monitoring function for excessively long starting time on machines with a risk of difficult starting:
Machines with high resistive torque, high inertia machines.
Monitoring of machines during steady state operation: Overtorque detection function
Machines with strong risk of jamming, machines with torque build-up over time,
Mechanical failure monitoring,
Faster detection of malfunctioning on machines where the motor is oversized in relation to its thermal protection I² T.
Motor protection for specific applications:
Machines with long starting times,
Machines with high on-load factor: More than 30 to 50 starts/hour,
Machine with fluctuating load from a steady state, where the thermal image of a thermal overload relay (thermal
Memory) is unsuitable in relation to actual overheating of the motor.
Examples of machines:
Conveyors, crushers and mixers,
Fans, pumps and compressors,
Centrifuges and spin-dryers,
Presses, shearing machines, saws, broaching machines, sanders and lifting hoists.
|setting range||range (1)||with contactor (2)||supply voltage||-3|
|0.3… 1.5||0.3… 1.3||LC1 D09… D38||a 200… 240 V||LR97 D015M7||0.172|
|a 100… 120 V||LR97 D015F7||0.172|
|c/a 24 V||LR97 D015B||0.172|
|c/a 48 V||LR97 D015E||0.172|
|1.2… 7||1.2… 6||LC1 D09… D38||a 200… 240 V||LR97 D07M7||0.172|
|a 100… 120 V||LR97 D07F7||0.172|
|c/a 24 V||LR97 D07B||0.172|
|c/a 48 V||LR97 D07E||0.172|
|5… 25||5… 21||LC1 D09… D38||a 200… 240 V||LR97 D25M7||0.172|
|a 100… 120 V||LR97 D25F7||0.172|
|c/a 24 V||LR97 D25B||0.172|
|c/a 48 V||LR97 D25E||0.172|
|20… 38||20… 34||LC1 D25… D38||a 200… 240 V||LR97 D38M7||0.172|
|a 100… 120 V||LR97 D38F7||0.172|
|c/a 24 V||LR97 D38B||0.172|
|c/a 48 V||LR97 D38E||0.172|
|Accessories (to be ordered separately)|
|use with||lots of||reference||kg|
|Pre-wiring kits allowing connection of||LC1 D09… D18||10||LAD 7C1||0.002|
|the LR97 D relay N/C contact directly||LC1 D25… D38||10||LAD 7C2||0.003|
|to the contactor|
|Terminal block for clip-on mounting on||LR97 D||1||LAD 7B106||0.1|
|35 mm rail (AM1 DP200)|