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LR97D38M7

LR97D38M7

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Manufacturer:	Schneider
Part number:	LR97D38M7

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All orders are subject to product availability. See our T&Cs.

Ask our team

| Email | +44 1785 218245

What happens next?

1. Email confirmation

You will get an email confirming that we have received your enquiry.

2. Dedicated Account Manager

One of our team will be in touch to confirm your part(s) specification and condition.

3. Your quote

You will receive a comprehensive quote tailored to your specific needs.

Schneider Electric LR97D38M7 is a TeSys LR97D electronic overcurrent relay designed to provide reliable motor overload protection and monitoring when used with TeSys D contactors (compatible with LC1D25…D38). It operates from a 200–240 V AC supply at 50/60 Hz and offers an adjustable thermal protection setting range of 20–38 A, making it well suited to a wide range of three‑phase motor applications. This relay supports phase-failure detection (typically within 3 seconds) and protection against locked-rotor or mechanical jamming conditions (I > 3 × current setting). A 1 C/O (changeover) output contact is provided for control circuit signalling, with clear status indication via two front LEDs. Flexible reset options include manual reset, electrical reset by briefly interrupting the supply, and an automatic reset with a fixed 120-second delay. Time-delay adjustments are available via front-mounted controls to help coordinate protection with the application. The unit can be mounted directly on the contactor or on a rail, with a compact footprint of 67.5 mm (H) × 45 mm (W) × 67.5 mm (D).

Typical applications

Motor overload protection for three-phase industrial motors with adjustable current settings from 20 to 38 A
Protection against phase failure (single-phasing) to help prevent overheating and motor damage
Locked-rotor and mechanical jamming detection where high current persists above the set threshold
Integration into TeSys D motor starter assemblies using compatible LC1D25 to LC1D38 contactors
Panel-building applications requiring compact electronic protection components on a contactor or DIN rail
Equipment protection in pump, fan and blower systems where load conditions can vary during operation
Conveyor and materials-handling drives where intermittent overloads and stalled conditions may occur
Compressor and HVAC plant motors where abnormal start or running currents need reliable monitoring
Machine tools and process machinery motor circuits needing repeatable electronic trip performance
Control-circuit signalling applications using a changeover (1 C/O) contact for trip indication and interlocking

Specification	Description
Manufacturer	Schneider Electric
Part Number	LR97D38M7
Product Type	Electronic overcurrent relay for motor protection applications
Range / Series	TeSys LR97D (TeSys D family)
Primary Function	Electronic overload protection with phase-failure sensitivity and locked-rotor / mechanical jamming detection
Rated Supply Voltage (Us)	200 to 240 V AC
Supply Frequency	50 to 60 Hz
Thermal Protection Adjustment Range	20 to 38 A
Tripping Threshold	20 to 34 A
Contact Configuration	1 C/O (changeover) output contact
Signalling	2 LED indicators
Reset Modes	Automatic reset (fixed 120 s), manual reset, or electrical reset by interrupting supply for ≥ 0.1 s
Time Settings	O-time adjustable 0.2 to 10 s and 0.3 to 10 s; D-time adjustable 0.5 to 30 s
Compatible Contactor Range	TeSys D contactors LC1D25 to LC1D38
Mounting	Direct mounting on contactor or rail mounting
Rated Operational Voltage (Ue)	Up to 690 V AC (power circuit, IEC 60947-4-1); up to 600 V AC (power circuit, UL/CSA)
Rated Insulation Voltage (Ui)	690 V (IEC); 600 V (UL/CSA)
Rated Impulse Withstand Voltage (Uimp)	6 kV
Surge Withstand	6 kV (IEC 61000-4-5)
Phase Failure Sensitivity	Trip in < 3 s (typical response)
Conventional Free Air Thermal Current (Ith)	3 A (control circuit)
Control Circuit Terminal Capacity	1 or 2 conductors, 1 to 25 mm² (flexible; with or without cable end; cable or lug-clamp)
Power Circuit Terminal Capacity	1 to 6 mm² (flexible, without cable end) or 2.5 to 10 mm² (flexible, with cable end; cable or lug-clamp)
Tightening Torque	Control circuit: 0.6 to 1.2 N·m (lug-clamp); Power circuit: 2 N·m (cable)
Degree of Protection	IP20 (IEC 60529)
Operating Temperature	-25 to +60 °C
Storage Temperature	-30 to +80 °C
Maximum Operating Altitude	2000 m
Dimensions (H × W × D)	67.5 × 45 × 67.5 mm
Net Weight	0.172 kg
Standards	IEC 60947; IEC 60255-6
Product Certifications	UL, CSA, GOST
Protective Treatment	TH (IEC 60068)

What does an electronic overcurrent relay do in a motor starter?

It monitors motor current and trips when overload conditions occur, helping to protect the motor against overheating. This unit also detects phase failure and can respond to locked-rotor or mechanical jamming conditions when current rises above a multiple of the set value.

What supply voltage does it require?

It is designed for a 200 to 240 V AC supply, 50/60 Hz.

What current range can be set for thermal protection?

The thermal protection adjustment range is 20 to 38 A, allowing you to set protection according to the motor’s full-load current.

How quickly does it detect phase failure?

Phase failure sensitivity is specified as less than 3 seconds.

How does it respond to locked-rotor or mechanical jamming conditions?

It is designed to detect locked rotor/mechanical jamming when current exceeds 3 times the configured current setting (I > 3 × Isetting) and then trip accordingly.

What mounting options are available?

It can be mounted directly on compatible contactors (LC1D25 to LC1D38) or mounted on a DIN rail.

What type of output contact does it provide?

It provides one changeover contact (1 C/O) for control/indication circuits.

What reset options are available after a trip?

Reset can be automatic (fixed 120 seconds), manual, or electrical by interrupting the power supply for a minimum of 0.1 seconds.

What time-delay adjustments are available?

Time adjustment is provided via front controls with ranges including 0.2 to 10 seconds (O-time knob), 0.3 to 10 seconds (O-time knob), and 0.5 to 30 seconds (D-time knob), depending on the selected function.

How is status indicated on the unit?

It includes two LEDs for local signalling and status indication.

What are the key electrical ratings for insulation and impulse withstand?

Rated impulse withstand voltage (Uimp) is 6 kV. Rated insulation voltage (Ui) is up to 690 V (IEC) for the power circuit and 600 V (UL/CSA) for the power circuit, with rated operational voltage up to 690 V AC 50/60 Hz (IEC) for the power circuit.

What are the operating environment limits and enclosure rating?

It is rated IP20 and is specified for operation from -25 to +60 °C, with storage from -30 to +80 °C, and operation up to 2000 m altitude.

What cable sizes and tightening torques should be used on the terminals?

Control circuit terminals accept flexible conductors typically from 1 to 25 mm² (with or without cable end, depending on termination method). Power circuit terminals accept flexible conductors typically from 1 to 6 mm² (without cable end) or 2.5 to 10 mm² (with cable end). Tightening torque is 0.6 to 1.2 N·m for the control circuit on lug-clamp terminals and 2 N·m for the power circuit on cable connections.

What are the approximate dimensions and weight for panel layout planning?

Overall dimensions are approximately 67.5 mm (H) × 45 mm (W) × 67.5 mm (D), with a net weight of about 0.172 kg.

Which product standards and approvals are referenced for this device?

It is specified against IEC 60947 and IEC 60255-6, and product certifications include UL, CSA and GOST (as referenced in the product data).

Typical applications

Motor overload protection for three-phase industrial motors with adjustable current settings from 20 to 38 A
Protection against phase failure (single-phasing) to help prevent overheating and motor damage
Locked-rotor and mechanical jamming detection where high current persists above the set threshold
Integration into TeSys D motor starter assemblies using compatible LC1D25 to LC1D38 contactors
Panel-building applications requiring compact electronic protection components on a contactor or DIN rail
Equipment protection in pump, fan and blower systems where load conditions can vary during operation
Conveyor and materials-handling drives where intermittent overloads and stalled conditions may occur
Compressor and HVAC plant motors where abnormal start or running currents need reliable monitoring
Machine tools and process machinery motor circuits needing repeatable electronic trip performance
Control-circuit signalling applications using a changeover (1 C/O) contact for trip indication and interlocking

Specification	Description
Manufacturer	Schneider Electric
Part Number	LR97D38M7
Product Type	Electronic overcurrent relay for motor protection applications
Range / Series	TeSys LR97D (TeSys D family)
Primary Function	Electronic overload protection with phase-failure sensitivity and locked-rotor / mechanical jamming detection
Rated Supply Voltage (Us)	200 to 240 V AC
Supply Frequency	50 to 60 Hz
Thermal Protection Adjustment Range	20 to 38 A
Tripping Threshold	20 to 34 A
Contact Configuration	1 C/O (changeover) output contact
Signalling	2 LED indicators
Reset Modes	Automatic reset (fixed 120 s), manual reset, or electrical reset by interrupting supply for ≥ 0.1 s
Time Settings	O-time adjustable 0.2 to 10 s and 0.3 to 10 s; D-time adjustable 0.5 to 30 s
Compatible Contactor Range	TeSys D contactors LC1D25 to LC1D38
Mounting	Direct mounting on contactor or rail mounting
Rated Operational Voltage (Ue)	Up to 690 V AC (power circuit, IEC 60947-4-1); up to 600 V AC (power circuit, UL/CSA)
Rated Insulation Voltage (Ui)	690 V (IEC); 600 V (UL/CSA)
Rated Impulse Withstand Voltage (Uimp)	6 kV
Surge Withstand	6 kV (IEC 61000-4-5)
Phase Failure Sensitivity	Trip in < 3 s (typical response)
Conventional Free Air Thermal Current (Ith)	3 A (control circuit)
Control Circuit Terminal Capacity	1 or 2 conductors, 1 to 25 mm² (flexible; with or without cable end; cable or lug-clamp)
Power Circuit Terminal Capacity	1 to 6 mm² (flexible, without cable end) or 2.5 to 10 mm² (flexible, with cable end; cable or lug-clamp)
Tightening Torque	Control circuit: 0.6 to 1.2 N·m (lug-clamp); Power circuit: 2 N·m (cable)
Degree of Protection	IP20 (IEC 60529)
Operating Temperature	-25 to +60 °C
Storage Temperature	-30 to +80 °C
Maximum Operating Altitude	2000 m
Dimensions (H × W × D)	67.5 × 45 × 67.5 mm
Net Weight	0.172 kg
Standards	IEC 60947; IEC 60255-6
Product Certifications	UL, CSA, GOST
Protective Treatment	TH (IEC 60068)