AT 50 B420L Current Sensor Equivalent & Substitute Parts

Part Overview

The AT 50 B420L is an active current sensor manufactured by LEM USA Inc., designed for AC current measurement applications. This transformer-based current sensor with integrated conditioning circuitry delivers a ratiometric 4mA to 20mA output signal proportional to the measured current. The device operates across industrial frequency standards (50/60Hz) and maintains Active product status with full RoHS compliance and REACH unaffected certification. Substitute parts are identified when application requirements differ in current measurement range while maintaining identical electrical performance characteristics, output signal conditioning, and mechanical compatibility.

Substiute Parts

AT 50 B420L

LEM USA Inc.In Stock: 1148AT 50 B420L Datasheet

Current PartRFQ

AT 20 B420L

LEM USA Inc.In Stock: 1164AT 20 B420L Datasheet

Parametric EquivalentRFQ

AT 5 B420L

LEM USA Inc.In Stock: 1170AT 5 B420L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT 50 B420L are identified within the LEM USA Inc. AT series based on current-sensing range compatibility. The AT 5 B420L and AT 20 B420L are parametric equivalents that maintain identical electrical performance specifications across all critical parameters except current measurement capacity.

Key Parameters Determining Substitution:

• Sensor Type: Transformer w/Conditioning (identical across all variants)
• Output Signal: Ratiometric, 4mA ~ 20mA (identical across all variants)
• Frequency Response: 50/60Hz (identical across all variants)
• Linearity: ±0.5% (identical across all variants)
• Accuracy: ±1.5% (identical across all variants)
• Supply Voltage: 20V ~ 30V (identical across all variants)
• Response Time: 100ms (identical across all variants)
• Operating Temperature: -20°C ~ 60°C (identical across all variants)
• Polarization: Bidirectional (identical across all variants)
• Mounting Type: Chassis Mount (identical across all variants)
• Package / Case: Module (identical across all variants)
• RoHS Status: RoHS Compliant (identical across all variants)
• REACH Status: REACH Unaffected (identical across all variants)

Variable Parameter:

• Current - Sensing Range: 50A (AT 50 B420L), 20A (AT 20 B420L), 5A (AT 5 B420L)

Substitution is valid when the application current measurement requirement does not exceed the rated sensing capacity of the alternative part.

Parameter Comparison

Engineering Selection Recommendations

All three parts—AT 50 B420L, AT 20 B420L, and AT 5 B420L—maintain Active product status with identical RoHS Compliant and REACH Unaffected certifications. Selection between these variants is determined solely by the maximum AC current measurement requirement of the application.

AT 50 B420L is specified for applications requiring measurement of AC currents up to 50A with the full 4mA to 20mA output signal range.

AT 20 B420L is specified for applications requiring measurement of AC currents up to 20A. This part delivers identical output signal conditioning and accuracy performance within its 20A measurement range.

AT 5 B420L is specified for applications requiring measurement of AC currents up to 5A. This part delivers identical output signal conditioning and accuracy performance within its 5A measurement range.

All three parts share identical mechanical mounting (Chassis Mount, Module package), electrical supply requirements (20V to 30V), response characteristics (100ms), and operating temperature range (-20°C to 60°C). Substitution is valid when the application current does not exceed the rated sensing capacity of the selected part.

Frequently Asked Questions (FAQ)

Q: Can the AT 20 B420L substitute for the AT 50 B420L?

A: The AT 20 B420L is a parametric equivalent only for applications where the maximum AC current measurement requirement does not exceed 20A. If the application requires measurement of currents above 20A, the AT 20 B420L cannot be substituted. All other electrical and mechanical specifications are identical.

Q: Can the AT 50 B420L substitute for the AT 20 B420L?

A: The AT 50 B420L can be used in applications specified for the AT 20 B420L. The AT 50 B420L provides a higher current measurement range (50A) while maintaining identical output signal conditioning, accuracy (±1.5%), linearity (±0.5%), and all other electrical characteristics. The 4mA to 20mA output signal will scale proportionally across the full 50A range.

Q: What is the difference between these three current sensor models?

A: The AT 5 B420L, AT 20 B420L, and AT 50 B420L differ only in their current-sensing range (5A, 20A, and 50A respectively). All other specifications—output signal type (Ratiometric, 4mA ~ 20mA), frequency response (50/60Hz), accuracy (±1.5%), linearity (±0.5%), supply voltage (20V ~ 30V), response time (100ms), operating temperature (-20°C ~ 60°C), mounting type (Chassis Mount), and compliance certifications (RoHS Compliant, REACH Unaffected)—are identical across all three variants.

Q: Are these parts interchangeable in terms of physical mounting?

A: Yes. All three parts share identical mounting specifications: Chassis Mount type and Module package configuration. Physical installation and mechanical compatibility are identical across AT 5 B420L, AT 20 B420L, and AT 50 B420L.

Q: Do these sensors require different supply voltages?

A: No. All three current sensor variants operate with identical supply voltage requirements of 20V to 30V and maximum supply current of 30mA. Power supply specifications are identical across all variants.

Q: What is the output signal format for all three parts?

A: All three parts deliver identical output signal conditioning: Ratiometric, 4mA to 20mA. The output signal scales proportionally with the measured AC current within each part's rated sensing range. A 4mA output represents zero current, and 20mA represents the maximum rated current for that specific variant.