Overload Relays

Overload Relays

Set Descending Direction

Items 1-12 of 30

Page
per page
As low as £67.25 £56.04
Setting Range: 0.10...0.32A, 0.30...1.0A, 0.80...2.7A, 1.90...6.3A, 5.70...18.9A



As low as £44.83 £37.36
Setting Range: 4.5...6.3A, 5.5...8.0A, 7.0...10.0A, 9.0...12.5A, 11.0...16.0A, 14.0...20.0A, 17.0...22.0A, 20.0...25.0A



As low as £37.85 £31.54
Setting Range: 0.11...0.16A, 0.14...0.2A, 0.18...0.25A, 0.22...0.32A, 0.28...0.4A, 0.35...0.5A, 0.45...0.63A, 0.55...0.8A, 0.7...1.0A, 0.9...1.25A, 1.1...1.6A, 1.4...2.0A, 1.8...2.5A, 2.2...3.2A, 2.8...4.0A, 3.5...5.0A, 4.5...6.3A, 5.5...8.0A, 7.0...10.0A, 9...12.0A



As low as £97.99 £81.66
Setting Range: 12.5...50.0A, 32.0...115.0A



As low as £87.82 £73.18
Setting Range: 12.0...50.0A, 20.0...80.0A



As low as £54.02 £45.02
Setting Range: 3.0...12.0A, 10.0...40.0A



As low as £47.28 £39.40
Setting Range: 0.32...1.25A, 1.0...4.0A, 3.0...12.0A, 4.0...16.0A



As low as £46.51 £38.76
Setting Range: 0.32...1.25A, 1.0...4.0A, 3.0...12.0A, 6.0...25.0A, 12.5...50.0A, 25.0...100.0A, 50.0...200.0A, 160.0...630.0A



As low as £73.90 £61.58
Setting Range: 40...51A, 48...60A, 57...68A, 65...78A, 75...87A, 84...96A



As low as £59.45 £49.54
Setting Range: 22...28A, 25...33A, 30...40A, 36...47A, 44...53, 50...60A, 57...67A



As low as £33.05 £27.54
Setting Range: 0.10...0.13A, 0.13...0.17A, 0.17...0.23A, 0.23...0.31A, 0.31A...0.41A, 0.41...0.55A, 0.55...0.74A, 0.74...1.0A, 1.0...1.3A, 1.3...1.7A, 1.7...2.3A, 2.3...3.1A, 3.1...4.2A, 4.2...5.7A, 5.7...7.6A, 7.6...10A, 10...13A, 13...16A, 16...20A, 20...24A, 24...29A, 29...35A, 35...38/40A



As low as £289.72 £241.43
Setting Range: 63...210A, 115...380A, 150...500A, 250...800A



Set Descending Direction

Items 1-12 of 30

Page
per page

Overload Relays

Overload Relays offer precise and reliable protection for low voltage electric motors which can be used in a wide variety of applications. They are used to prevent damage to an electric motor from overloading, or phase asymmetry/failure. They also protect against any internal fault or damage in the motor's electromagnetic windings, and against short circuits in the connecting cables.

At Rowse Automation our product portfolio encompasses Thermal, Electronic and Solid State Overload Relays. Thermal sensing devices operate when a certain temperature is reached in the motor when an overload or phase failure occurs. These fault states cause a bimetallic strip to heat inside the device when then bend and as a result trigger the auxiliary contacts by means of a tripping mechanism. When either of these sensors are triggered by overheating, the auxiliary contacts turn off the motor via its contactor coil. This happens relatively slowly, which allows the motor to draw a higher starting current before tripping the overload protection relay. Electronic sensing devices offer current dependant protection of loads with normal and heavy starting, thermal temperature rises due to overload, phase asymmetry or phase failure. Electronic Relays operate when an overload, phase asymmetry or phase failure increase the motor current beyond the set rated motor current. The current rise is detected by integrated current transformers and evaluated by corresponding solid-state circuits that then switch the output.

A Solid State Overload Relay serves the same purpose as an electro-mechanical Overload Relay, but it has no moving parts. It consists of a sensor unit and solid state electronic switching device, which will switch off or on in response to a control signal, together with a coupling mechanism that enables this signal to activate the switching device. Solid State Relays use semiconductors, and can switch an induction motor much faster than an electro-mechanical relay, but their switching applications are more limited.

Rowse Automation offers a variety of Thermal and Solid-State Overload Relays, for different sizes and amperages, together with Terminal Brackets for stand-alone installation.