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Overload Relay Type
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Your choices are...
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Bimetallic Thermal Relay
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Bimetallic thermal relays consist of two strips of different metals. These dissimilar metals are permanently joined. Heating the bimetallic strip causes it to bend because the dissimilar metals expand and contract at different rates. The bimetallic strip also applies tension to a spring on a contact. If heat begins to rise, the strip bends and the spring pulls the contacts apart, breaking the circuit.
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Eutectic Alloy Thermal Relay
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Eutectic (melting alloy) thermal relays consist of a heater coil, a eutectic alloy, and a mechanical mechanism which activates a tripping device when an overload occurs. To measure the temperature of the motor, the relay monitors the amount of current being drawn. This is done indirectly, through a heater coil.
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Solid State Overload Relay
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Solid-state overload relays do not have moving, mechanical parts. Instead, they calculate the average temperature within the motor by monitoring its starting and running currents. Solid-state overload relays are a type of overcurrent relay.
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Temperature Control (Probe) Thermal Relay
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These relays protect the motor by using thermistor or resistance temperature detector (RTD) probes to directly sense the windings' temperature. The motor must have one or more positive temperature coefficient (PTC) thermistor probes embedded in its windings. When the probe's nominal operating temperature is reached, the resistance increases rapidly. This increase is detected by a threshold circuit that controls a set of relay contacts.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Full Load Current Range
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The adjustable current value allows the relay to be set to the full-load current shown on the motor-rating plate. Full-load current range is the current range that can be adjusted to the desired trip point.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Temperature Trip Range
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Temperature trip range is the trip-point setting range for relays that are designed to monitor the temperature of the motor stator windings.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Trip Class
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Trip class is the maximum time (in seconds) at which the overload relay trips when carrying current at 600% of its current rating. Bimetallic overload relays can be rated as Class 10, meaning that they break the circuit no more than 10 seconds after a locked rotor condition begins. Generally, melting alloy overload relays are Class 20 devices.
Although thermal overload relays are designed to protect motors against overload currents, they must be capable of handling large currents without tripping for short periods during motor starting (run-up). They should, however, trip quickly if the starting currents last too long.
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Search Logic:
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User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Motor / Load Phase
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Your choices are...
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Single Phase Protection
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The motor load is single phase.
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Three Phase Protection
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The motor load is three phase.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Maximum Motor Voltage
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The applicable maximum motor voltage.
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Search Logic:
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All matching products will have a value greater than or equal to the specified value.
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Control Voltage
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The control voltage is specified if it is different from the motor voltage. This is called "separate control" because the control circuit gets its power from a separate source, usually lower in voltage than the motor's power source.
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Search Logic:
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All matching products will have a value greater than or equal to the specified value.
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Contact Current Rating
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Contact current rating is the maximum current for which the relay's contacts are rated.
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Search Logic:
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All matching products will have a value greater than or equal to the specified value.
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Contact Maximum Rated Voltage
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Contact maximum rated voltage is the maximum voltage for which relay contacts are rated.
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Search Logic:
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All matching products will have a value greater than or equal to the specified value.
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Pole Specifications
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Your choices are...
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Single Pole (SP)
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Single pole (SP) relays have a single, moveable lever with a contact at the end.
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Double Pole (DP)
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Double pole (DP) relays consist of two, single-pole contacts that are concurrently actuated by the same mechanical system and operation. Typically, the first line is hot and the second is neutral.
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Triple Pole (TP)
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Triple pole (TP) relays consist of three single-pole contact systems.
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Four Pole (4P)
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Relays with more than three poles are indicated by the number of single-pole contacts followed by the letter "P". For example, four-pole relays are 4P devices.
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> 4 Poles
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This category includes relays with more than four circuit contacts.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Features
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Your choices are...
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Automatic Reset?
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The relay resets automatically after conditions return to normal.
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Ambient Temperature Compensation
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Overload relays with ambient temperature compensation operate reliably over a wide ambient range.
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Phase Failure (Loss)?
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The relay monitors for voltage with the incorrect phase sequence, or one or more phases open.
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Phase Reversal?
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Phase reversal is a change of one-half cycle or 180° in phase.
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Phase Unbalance?
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The relay operates when the magnitude of one current exceeds the magnitude of another current by a predetermined degree. Voltage balance operates in a similar manner.
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Underload Detection
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Underload protection determines when a motor, which is normally running on load, is accidentally unloaded. This may occur, for example, if a pump runs dry. The reduction in motor current is sensed, and the tripping point can be set.
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Visual Indicator
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The relay has visual indicator such as a light-emitting diode (LED).
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Operating Temperature
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This is the full-required range of ambient operating temperature. This represents the surrounding air temperature limits.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Part Numbers for Thermal Overload Relays
| Part # |
Distributor |
Manufacturer |
Product Category |
Description |
| BMF904 |
PLC Radwell |
MATSUSHITA ELECTRIC
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Not Provided
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THERMAL OVERLOAD RELAY |
| LR1D09314A65 |
PLC Radwell |
TELEMECANIQUE
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Not Provided
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RELAY THERMAL OVERLOAD |
| TA25DU52 |
PLC Radwell |
ASEA BROWN BOVERI
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Not Provided
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THERMAL OVERLOAD RELAY 36-52 AMPS |
| CT372 |
PLC Radwell |
SPRECHER & SCHUH
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Not Provided
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THERMAL OVERLOAD RELAY 58-72AMP |
| 9065TE32 |
PLC Radwell |
SQUARE D
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Not Provided
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THERMAL OVERLOAD RELAY 32-39AMPS |
| C306GN3 |
PLC Radwell |
CUTLER HAMMER
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Not Provided
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THERMAL OVERLOAD RELAY 75A MAX |
| C316FNA3P |
PLC Radwell |
CUTLER HAMMER
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Not Provided
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THERMAL OVERLOAD RELAY 7.5 TO 11AMP |
| CR124N028 |
PLC Radwell |
GENERAL ELECTRIC
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Not Provided
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THERMAL OVERLOAD RELAY NEMA4 SPDT |
| 193TAC24 |
PLC Radwell |
ALLEN BRADLEY
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Not Provided
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OVERLOAD RELAY THERMAL TYPE 16-24 AMP |
| 48JA18AA4 |
PLC Radwell |
FURNAS ELECTRIC CO
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Not Provided
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OVERLOAD THERMAL RELAY |
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