AT 20 B420L Current Sensor Equivalent & Substitute Parts

Part Overview

The AT 20 B420L is an AC current transformer sensor manufactured by LEM USA Inc., designed for measuring alternating currents up to 20A with integrated signal conditioning. This module provides ratiometric output in the 4mA to 20mA range, suitable for industrial measurement and control applications. The product is Active status and RoHS Compliant, ensuring compliance with current environmental regulations. Substitute parts are identified when application requirements permit operation at different current sensing ranges while maintaining compatibility with the electrical and mechanical interface specifications.

Substiute Parts

AT 20 B420L

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

Current PartRFQ

AT 5 B420L

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT 20 B420L is limited to parts within the LEM USA Inc. AT series that maintain identical electrical and mechanical interface specifications. The critical parameters that determine substitutability are:

Fixed Parameters (Must Match):

• Sensor Type: Transformer w/Conditioning
• Number of Channels: 1
• Output Type: Ratiometric, 4mA ~ 20mA
• Frequency: 50/60Hz
• Linearity: ±0.5%
• Accuracy: ±1.5%
• Voltage - Supply: 20V ~ 30V
• Response Time: 100ms
• Current - Supply (Max): 30mA
• Operating Temperature: -20°C ~ 60°C
• Polarization: Bidirectional
• Mounting Type: Chassis Mount
• Package / Case: Module

Variable Parameter (Determines Substitution):

• Current - Sensing Range: The AT series offers multiple current ratings. Substitution is valid only when the application's maximum current requirement does not exceed the substitute part's rated sensing range.

The AT 5 B420L is identified as a parametric equivalent because it maintains all fixed parameters while offering a 5A current sensing range, suitable for applications requiring lower current measurement capacity.

Parameter Comparison

Engineering Selection Recommendations

AT 20 B420L Selection Criteria: Select the AT 20 B420L when the application requires measurement of AC currents up to 20A with the specified output and conditioning characteristics. This part is suitable for industrial control systems, power monitoring, and current measurement applications operating within the -20°C to 60°C temperature range and 50/60Hz frequency specifications.

AT 5 B420L Substitution Criteria: The AT 5 B420L is a valid substitute only when the maximum AC current to be measured does not exceed 5A. Both parts maintain identical electrical interface specifications, output characteristics, and mechanical mounting requirements. The substitution is valid from a system integration perspective when current capacity requirements are satisfied.

Compliance Considerations: Both parts are RoHS Compliant and carry Active product status, ensuring availability and regulatory compliance for new designs and production applications. Both parts are classified under ECCN EAR99 and HTSUS 9030.33.3800.

Frequently Asked Questions (FAQ)

Q: Can the AT 5 B420L replace the AT 20 B420L in all applications?

A: No. The AT 5 B420L is a valid substitute only when the application's maximum AC current requirement does not exceed 5A. If the circuit carries currents above 5A, the AT 5 B420L will not operate within specification. The AT 20 B420L must be used for applications requiring measurement of currents between 5A and 20A.

Q: Are the output signal characteristics identical between AT 20 B420L and AT 5 B420L?

A: Yes. Both parts provide identical ratiometric output in the 4mA to 20mA range, identical linearity (±0.5%), accuracy (±1.5%), response time (100ms), and frequency response (50/60Hz). The difference is only in the current sensing range.

Q: Do both parts require the same supply voltage?

A: Yes. Both the AT 20 B420L and AT 5 B420L require a supply voltage of 20V to 30V and draw a maximum of 30mA.

Q: Are the mounting and packaging identical?

A: Yes. Both parts are Chassis Mount modules with identical mechanical interfaces and package specifications.

Q: Can I use the AT 20 B420L in place of the AT 5 B420L?

A: Yes. The AT 20 B420L can be used in applications designed for the AT 5 B420L. The 20A rated sensor will operate correctly when measuring currents up to 5A, though it provides measurement capacity beyond the application requirement.

Q: What is the difference in current sensing range between these parts?

A: The AT 20 B420L measures AC currents up to 20A, while the AT 5 B420L measures AC currents up to 5A. Both convert the measured current to a 4mA to 20mA output signal proportional to the input current within their respective ranges.

Q: Are both parts available in the same packaging format?

A: Yes. Both parts are supplied in Bulk packaging as Chassis Mount modules with identical case specifications.