TeSys LT47 electronic over current relays-automatic- 3...30 A - 200...240 V AC - LT4730M7A
TeSys LR47 electronic overcurrent relay, 30A/690V, with automatic reset, to be supplied with 200-240V AC, for protection of motors with a rated current 3-25A.
It provides 3 dials to adjust the protection, LOAD (3-30A) for the overcurrent level, O-TIME (0.3-10sec) for the acceptable duration of the overcurrent, R-TIME (1-120sec) for the automatic reset delay.
In addition, the device trips when there is a missing phase during more than O-TIME.
The device has a reset button, a test/stop button, 2 LED indicators (Run/Trip), 2 auxiliary contacts 1NO+1NC for fault signalling.
Settings can be locked by sealing the transparent cover.
DIN rail mounting, without power terminals (currents monitored by 2 current transformers crossed by the motor cables).
Multi standards certified (IEC, UL, CSA, CCC, EAC), it conforms to RoHS/REACh regulation.
| Attribute | Value |
|---|---|
| SKU | LT4730M7A |
| product certifications | CSA, UL |
| ambient air temperature for storage | -30-80 °C |
| ambient air temperature for operation | -25-60 °C without derating conforming to IEC 60947-4-1 |
| time range | 1...120 s - control type R-time, 0.3...30 s - control type O-time |
| range of product | TeSys LT electronic over current relays |
| product or component type | Electronic Over Current Relay |
| net weight | 0.192 kg |
| standards | IEC 60947, IEC 60255-6 |
| device short name | LT47 |
| range | TeSys LT |
| product name | TeSys LT |
| mechanical robustness | shocks: 15 Gn for 11 ms conforming to IEC 60068-2-7, vibrations: 4 gn conforming to IEC 60068-2-6 |
| [Ith] conventional free air thermal current | 3 A for signalling circuit |
| [Us] rated supply voltage | 200...240 V AC |
| electromagnetic compatibility | resistance to electrostatic discharge: 8 kV in open air conforming to IEC 61000-4-2, resistance to electrostatic discharge: 6 kV in direct mode conforming to IEC 61000-4-2, conducted emission: class A conforming to EN 55011, immunity to electromagnetic interference: 10 V/m conforming to IEC 61000-4-3, immunity to fast transients: 2 kV conforming to IEC 61000-4-4, surge withstand: 6 kV conforming to IEC 61000-4-5, conducted HF disturbances: 10 V conforming to IEC 61000-4-6 |
| relay application | sensitivity to phase failure, locked rotor, mechanical jamming I > 3 x Isetting, overload Imax > Isetting |
| tripping threshold | 3...25 A |
| network frequency | 50...60 Hz |
| connections - terminals | signalling circuit: screw clamp terminals 1 1-2.5 mm² - cable stiffness: flexible with cable end, signalling circuit: screw clamp terminals 1 1-2.5 mm² - cable stiffness: flexible without cable end, signalling circuit: screw clamp terminals 2 1-2.5 mm² - cable stiffness: flexible with cable end, signalling circuit: screw clamp terminals 2 1-2.5 mm² - cable stiffness: flexible without cable end |
| height | 70.3 mm |
| mounting support | rail |
| compatibility code | LT47 |
| width | 71 mm |
| depth | 77.2 mm |
| operating altitude | 2000 m |
| dielectric strength | 2 kV at 50 Hz conforming to IEC 60255-5 |
| IP degree of protection | IP20 conforming to IEC 60529, IP20 conforming to VDE 0106 |
| tightening torque | signalling circuit: 1.7 N.m M3.5 |
| device application | protection |
| control type | automatic: reset |
| local signalling | 1 LED (green), 1 LED (red) |
| [Ui] rated insulation voltage | power circuit: 600 V AC conforming to CSA, power circuit: 600 V AC conforming to UL, power circuit: 690 V AC conforming to IEC 60947-4-1 |
| auxiliary contact composition | 1 NO + 1 NC |
| associated fuse rating | 3 A gG for signalling circuit, 3 A BS for signalling circuit |
| protective treatment | TH conforming to IEC 60068 |
| thermal protection adjustment range | 3-30 A |