Schneider Electric TeSys LRD Thermal Overload Relays 37-50A Class 10A LRD3357
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Brand : Schneider Electric
Type : Thermal Overload Relays
Description
Schneider Electric LRD3357 TeSys LRD Thermal Overload Relay is a protective device used in electrical circuits to prevent overheating of motors or other electrical equipment. It works by monitoring the current passing through the circuit and tripping the circuit if it detects an overload condition.
37-50A is the range of current that the thermal overload relay is designed to handle. It means the relay is suitable for applications where the current is expected to be between 37 and 50 amperes. If the current exceeds this range, the relay will trip to protect the circuit. Class 10A is the trip class of the thermal overload relay. Trip classes define the response time of the relay to an overload condition. The relay will trip within 10 seconds when it detects an overload.
In summary, Schneider Electric LRD3357 TeSys LRD Thermal Overload Relay is designed for applications where the current is expected to be between 37 and 50 amperes, and it has a trip class of 10A, meaning it will trip within 10 seconds in response to an overload condition. This particular relay is suitable for protecting circuits with motors or equipment that draw current in this range.
Features
- 37-50A Th Overload Relay
- Protect motors from overloads and phase failures
- Easier to install and operate with multi-standard screws
| Brand | Schneider Electric |
| Item Name | Thermal Overload Relays |
| Model | LRD3357 |
| Conventional Free Air Thermal Current | 5 A for Signalling Circuit |
| Rated Operational Voltage Limits | 1000 V AC 0...400 Hz for power circuit conforming to IEC 60947-4-1 |
| Rated Insulation Voltage | power circuit: 1000 V conforming to IEC 60947-4-1, power circuit: 600 V conforming to CSA, power circuit: 600 V conforming to UL |
| Rated Impulse Withstand Voltage | 6 kV conforming to IEC 60947-1 |
| Ambient Air Temperature For Operation | -20-60 °C without derating conforming to IEC 60947-4-1 |
| Ambient Air Temperature For Storage | -60-70 °C |
| Associated Fuse Rating | 4 A gG for signalling circuit, 4 A BS for signalling circuit |
| Auxiliary Contact Composition | 1 NO + 1 NC |
| Climatic Withstand | Conforming to IACS E10 |
| Compatibility Code | LRD |
| Connections - Terminals | power circuit: screw clamp terminals 1 cable(s) 4-35 mm² flexible without cable end, power circuit: screw clamp terminals 1 cable(s) 4-35 mm² flexible with cable end, power circuit: screw clamp terminals 1 cable(s) 4-35 mm² solid without cable end, control circuit: screw clamp terminals 2 cable(s) 1-2.5 mm² flexible without cable end, control circuit: screw clamp terminals 2 cable(s) 1-2.5 mm² flexible with cable end, control circuit: screw clamp terminals 2 cable(s) 1-2.5 mm² solid without cable end |
| Control Type | Red Push-button: stop, blue push-button: reset |
| Depth | 115 mm |
| Dielectric Strength | 2.2 kV at 50 Hz conforming to IEC 60947-1 |
| Flame Retardance | V1 conforming to UL 94 |
| Height | 81 mm |
| IP Degree Of Protection | IP20 Conforming to IEC 60529 |
| Mechanical Robustness | vibrations: 6 Gn conforming to IEC 60068-2-6, shocks: 15 Gn for 11 ms conforming to IEC 60068-2-7 |
| Mounting Support | Plate, with specific accessories, rail, with specific accessories, under contactor |
| Network Frequency | 0...400 Hz |
| Network Type | DC, AC |
| Permissible Current | 0.72 A at 500 V AC-15 for signalling circuit, 0.06 A at 440 V DC-13 for signalling circuit |
| Phase Failure Sensitivity | Tripping Current 130 % of Ir on two phase, the last one at 0 |
| Certifications | IEC, UL, CSA, CCC, EAC, ATEX INERIS, UKCA |
| Compatibility | LC1D95, LC1D80 |
| Range | TeSys, TeSys Deca |
| Relay Application | Motor Protection |
| Standards | EN/IEC 60947-4-1, EN/IEC 60947-5-1, UL 60947-4-1, UL 60947-5-1, CSA C22.2 No 60947-4-1, CSA C22.2 No 60947-5-1, GB/T 14048.4, GB/T 14048.5, EN 50495 |
| Tightening Torque | control circuit: 1.7 N.m - on screw clamp terminals, power circuit: 9 N.m - on screw clamp terminals |
| Width | 70 mm |
| Temperature Compensation | -20-60 °C |
| Thermal Overload Class | Class 10A conforming to IEC 60947-4-1 |
| Thermal Protection Adjustment Range | 37-50 A |
| Tripping Threshold | 1.14 +/- 0.06 Ir conforming to IEC 60947-4-1 |
| Weight | 0.51 kg |
