Schneider Electric LRE10 EasyPact TVS 4-6 A Overload Relay

LRE10 overload relay, 4 to 6 A: what it does

The LRE10 is a Schneider Electric product listed in its datasheet as: EasyPact TVS differential thermal overload relay 4…6 A – class 10A. It is the thermal overload part of a motor starter: it follows the current drawn by the motor and opens a signalling contact when an overload or a lost phase would otherwise overheat the windings. Seven Star LLC supplies the LRE10 in Oman and the GCC as an independent supplier based in Muscat.

The reference tells you the family and the band. LRE is the device short name given in the datasheet, the range is Easy TeSys Protect, and the title states the adjustable window, 4 to 6 A, together with trip class 10A. The two or three digits after LRE are the range code of that band. The LRE10 is built on the compact body (45 mm wide) for LC1E contactors up to the LC1E38 size. The 4 to 6 A window serves motors a size above the small auxiliaries: modest pumps, fans and compressors that draw several amperes.

Setting the LRE10 correctly

The dial of the LRE10 spans 4 to 6 A. The datasheet states a tripping threshold of 1.14 +/- 0.06 Ir conforming to IEC 60947-4-1, so the relay is designed to act when the motor current reaches about 1.14 times the dialled value, with a tolerance of 0.06 times. At the top of the scale that is roughly 6.84 A and at the bottom roughly 4.56 A.

It is a differential relay, which matters on a three-phase motor. The datasheet gives a tripping current of 130 % of Ir on two phases while the third phase is at zero, conforming to IEC 60947-4-1; at the top of the dial 6 A that corresponds to about 7.8 A in each of the two live phases. A broken fuse or loose terminal therefore does not leave the motor running single-phased unnoticed.

Class 10A is the fast characteristic for motors that start quickly; the class number is the longest tripping time in seconds at 7.2 times the setting current under IEC 60947-4-1. Temperature compensation is listed over -20 to 60 °C, so the setting does not wander with panel temperature inside that band.

LRE10 datasheet values at a glance

Wiring the LRE10: power side and signalling side

On the power side the datasheet lists screw clamp terminals; for flexible cable without ferrule the capacity is 1.5 to 6 mm², and the recommended torque is 1.7 N.m. On the signalling side two screw clamp terminals take 1 to 2.5 mm² conductors at 1.7 N.m. Use a torque screwdriver, because heat cycling loosens starter terminals over time.

The auxiliary contact set is 1 NO + 1 NC. Wire the normally closed contact (95-96) in series with the contactor coil so a trip drops the starter, and use the normally open contact (97-98) for a fault lamp or PLC input. The datasheet gives a conventional thermal current of 5 A for signalling circuit and names a 5 A gG fuse for that circuit.

For the power circuit the datasheet names 16 A gG or 8 A aM fuses. That is about 2.67 times the top of the dial, a reminder that the fuse is for short circuits, while the relay deals with overloads.

Where the LRE10 sits in an LC1E starter

The datasheet lists the compatible contactors for the LRE10 as LC1E06 to LC1E38. Mounting options are listed as under contactor; plate, with specific accessories; rail, with specific accessories. In a normal starter the relay plugs directly under the contactor, which keeps the power wiring short and gives a compact direct-on-line starter without extra links.

The body measures 45 mm wide, 44.5 mm high and 70 mm deep with a net weight of 0.13 kg; the packed unit weighs 145 g. It is the last relay in the group that the datasheet lists from LC1E06 upward, so it can sit under the smallest contactors in the LC1E family.

Environment, standards and approvals for the LRE10

The datasheet gives an operating range of -20 to 60 °C without derating conforming to IEC 60947-4-1; -20 to 70 °C with derating and a storage range of -60 to 80 °C, with IP20 protection, fire resistance of 850 °C and mechanical robustness of 6 Gn shocks and 3 Gn vibrations. The standards named include EN/IEC 60947-1, 60947-4-1 and 60947-5-1.

Certifications listed for this exact reference are CB Scheme; CCC; CE; EAC. Do not assume any other approval; if the project needs a specific marine or hazardous-area certificate, tell us and we will check it against the datasheet before quoting.

Before you order the LRE10

• Motor nameplate current inside 4 to 6 A, ideally near the middle of the dial.
• Contactor in the starter must be one of LC1E06 to LC1E38.
• Class 10A: confirm that the load starts quickly enough for this characteristic.
• Upstream short-circuit device: 16 A gG or 8 A aM, per the datasheet.
• Space: allow 45 mm x 44.5 mm x 70 mm and 0.13 kg.
• Say whether the relay is for a new starter or replaces one that has tripped out of service.

Commissioning and spares for the LRE10

Set the dial of the LRE10 to the nameplate current of the motor, not to the contactor rating. Use the red stop push-button to confirm the contactor drops and the green reset push-button to restore the relay afterwards. After any short-circuit event inspect the relay and starter, because the overload relay does not replace the upstream fuse or breaker.

For spares keep the same reference instead of choosing by range alone, since the compatible contactor list differs from band to band (LC1E06 to LC1E38 for the LRE10). If you are unsure, send the contactor reference and the motor nameplate current and we will confirm the matching member of the family.

Information to send with an RFQ for the LRE10

• Full reference LRE10 and the quantity required
• Motor nameplate current, voltage and power
• Contactor reference the relay will be fitted to
• Delivery location and timing
• New starter, replacement or spare

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above, and it is the document to check against your own drawings.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.