Schneider Electric LRE14 EasyPact TVS 7-10 A Overload Relay

What the LRE14 protects, in plain terms

The LRE14 is a Schneider Electric product listed in its datasheet as: EasyPact TVS differential thermal overload relay 7…10 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 LRE14 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, 7 to 10 A, together with trip class 10A. The two or three digits after LRE are the range code of that band. The LRE14 is built on the compact body (45 mm wide) for LC1E contactors up to the LC1E38 size. The 7 to 10 A window is a very common band, because a lot of small pumps, fans, compressors and conveyors draw somewhere between 7 and 10 A.

LRE14 datasheet values at a glance

Fitting the LRE14 to a contactor

The datasheet lists the compatible contactors for the LRE14 as LC1E09 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 148 g. A nameplate current of 10 A sits at the top of this dial and at the bottom of the 9 to 13 A relay; decide which gives the more comfortable middle-of-scale setting.

Typical uses in Oman and the GCC

Starters of this type are found in water and desalination auxiliaries, oil and gas utility skids, power station balance-of-plant and building services across Oman and the GCC. The 7 to 10 A window is a very common band, because a lot of small pumps, fans, compressors and conveyors draw somewhere between 7 and 10 A..

Heat and dust are the practical enemies. The datasheet allows -20 to 60 °C without derating conforming to IEC 60947-4-1 without derating and IP20 protection, so the LRE14 belongs inside a closed, ventilated panel; in summer the inside of a sunlit enclosure can be far above the outdoor mean, so compare your measured panel temperature with that limit.

How the LRE14 trips: threshold, phase loss and class

The dial of the LRE14 spans 7 to 10 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 11.4 A and at the bottom roughly 7.98 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 10 A that corresponds to about 13 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.

Before you order the LRE14

• Motor nameplate current inside 7 to 10 A, ideally near the middle of the dial.
• Contactor in the starter must be one of LC1E09 to LC1E38.
• Class 10A: confirm that the load starts quickly enough for this characteristic.
• Upstream short-circuit device: 20 A gG or 12 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.

Neighbouring ranges around the LRE14

The table places the LRE14 between its nearest neighbours in this group, using the datasheet values of each. It helps when the nameplate current sits near a boundary or when the contactor decides the frame.

Commissioning, reset and spares

Set the dial of the LRE14 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 (LC1E09 to LC1E38 for the LRE14). 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 LRE14

• Full reference LRE14 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.