30/40/50 Amp Thermal Overload Relay, 220V, 3-Phase

$56.17

Thermal overload relay provides overcurrent and phase failure protection for AC motors. Current setting range 30-40Amp or 37-50Amp for selection, current rating 93A, working voltage 3-phase 220V~690V, insulation voltage 690V, matching 40A contactor and 63A/100A gG fuse breaker.

Current Setting Range *

SKU: ATO-TOR-304050

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Delivery date: 6-12 days

Overview
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Good price thermal overload relay for sale, whose main functions are overcurrent and phase failure protection. It is used to provide overload protection open-phase protection and protection against unbalanced current for motors and it can also avoid heating in electrical equipment. Optional current setting range 30-40A or 37-50A, rated current 93A, working power supply 3-phase 220V~690V. Suitable devices are 40A contactor and 63A/100A gG fuse breaker.

Specification

Model	ATO-JR28-93
Current Setting Range	23-32 A	30-40 A	37-50 A
Matching Fuse Breaker	63 gG	100 gG	100 gG
	40 aM	40 aM	63 aM
Trip Class	40A
Frame Current (A)	93A
Rated Working Voltage	3-phase 220V~690V
Rated Insulation Voltage	690V
Number of Contacts	1NO + 1NC
Phase Failure Protection Function	yes
Automatic & Manual Reset	yes
Temperature Compensation	yes
Tripping Indicator	yes
Test Pushbutton	yes
Mounting Mode	Plug-in, independent
AC-15 220V Current Rating	2.73A
AC-15 220V Current Rating	1.58A
DC-13 220V Current Rating	0.2A
Cross Section Area of Conductor (mm2)	Main Circuit	Single core or standard wire	4~35
		Wiring screw	M4
	Auxiliary Circuit	Single core or standard wire	0.5~2.5
		Wiring screw	M3.5

Details

Thermal Overload Relay Applications

Thermal overload relays are often used in circuit protection, overload, phase failure, overtime start and locked-rotor for AC motors.
Thermal overload relay has functions of phase failure protection, temperature compensation, adjustable setting current, automatic or manual reset, operation indicator, NP and NO auxiliary contacts separate insulation.
The thermal overload relay has small installation area and various mounting methods. It has test button and stop button, which is convenient for checking the flexibility of operation.
The protective cover of thermal overload relay can protect fingers from electric shock. The locking device can prevent misoperation.
Thermal overload relay comes with remote operation, complete functions and excellent quality.

30/40/50 Amp Thermal Overload Relay Dimension Diagram (Unit: mm)

Dimension diagram of 30/40/50 Amp Thermal Overload Relay, 220V, 3-Phase

Tips: Structural characteristics of 30/40/50 Amp thermal overload relay.

30/40/50 Amp Thermal overload relay has a current adjustment cam to adjust the setting current.
Thermal overload relay has a temperature compensation device to ensure that the operating characteristics are basically unchanged within the medium temperature range of -20℃～60℃.
30/40/50 Amp Thermal overload relay has a reset adjustment knob to adjust the reset mode. There are two reset states: manual and automatic.
Thermal overload relay has a tension spring flip and jump mechanism to ensure rapid and reliable contact action.
30/40/50 Amp Thermal overload relay has a differential phase failure/three-phase unbalance protection device.
Thermal overload relay has a detection slider/switch position indicator to simulate the tripping of the thermal relay and display the action status. Through this simulation method, check and ensure that the auxiliary circuit wiring is correct. When the marking on the slider is at the 0 mark, it is displayed as drop out. Located at the l mark, it is displayed as work.
30/40/50 Amp Thermal overload relay has a disconnect button. When the disconnect button is pressed, the normally closed contact opens the series contactor to disconnect the load. After releasing the disconnect button, the load will work again through the contactor.

A thermal relay is an electrical device used for overload protection in electric circuits. Its primary function is to safeguard motors and other electrical equipment from damage due to prolonged overcurrent conditions, such as excessive heat generated by high current flow.

Key Functions of a Thermal Relay:

Overload Protection:
- The relay detects excessive current in the circuit that could overheat the motor or connected equipment.
- If the current exceeds the set threshold for a prolonged period, the relay disconnects the circuit to prevent damage.
Temperature Monitoring:
- It operates based on the heat generated by the current. The relay contains a bimetallic strip or heating elements that bend or deform as they heat up due to overcurrent.
- The deformation triggers a trip mechanism, cutting off the power supply.
Automatic Reset or Manual Reset:
- Some thermal relays are designed to automatically reset after cooling down, while others require manual resetting after a fault.
Customization and Sensitivity:
- The relay settings can be adjusted to match the motor's rated current, ensuring precise protection without unnecessary trips.
Coordination with Other Components:
- Thermal relays are often used in conjunction with contactors and other protective devices in motor starter circuits to provide a comprehensive protection system.