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05048.R4 12/10

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420LB28 - 420LE60

TWO LINE PAIR 4-20mA CONTROL LOOP PROTECTOR

DEsCRIPTION

The 420LE/B series is a two stage transient voltage protector providing primary and secondary protection against

lightning, inductive switching and electrostatic discharge (ESD) transient threats. The first stage diverts the transient

current through the ground terminal return path and the second stage clamps the voltage to a safe level without inter-

ruption of service.

The 420LE/B series is designed to protect data lines from differential (line to line) and common mode (line to ground)

transients. Terminals 1 and 2, 3 and 4 for the 420LE and pins 2 and 3, 4, and 5 for the 420LB are designated as line

pairs. Each line pair is referenced to ground. A transient voltage suppressor is connected across each line pair for dif-

ferential mode protection. Each line pair is referenced to ground.

This product can also be used on telephone, signal/data lines, security, timing and control interface circuits. For most

applications, the product should be located as close as possible to the equipment being protected. A low impedance

grounding system is important to maintain a low voltage clamp between the line-to-ground connection.

FEATuREs

• Compatible with IEC 61000-4-2 (ESD): Air - 15kV, Contact - 8kV

• Compatible with IEC 61000-4-4 (EFT): 40A - 5/50ns

• Compatible with IEC 61000-4-5 (Surge): 95A, 8/20µs, Level 4 (Line-

Gnd) & 48A, Level 4 (Line-Line)

• Designed for 4-20mA Current Loops

• Automatic Reset - Does Not Interrupt Service

• Permanent Two-Stage Line Pair Protection

• Common Mode & Differential Mode Protection

• Subnanosecond Response Time

• Effective Against Lightning, Inductive Switching and ESD

MEChANICAL ChARACTERIsTICs

• Approximate Weight: 28 grams (420LB) & 142 grams (420LE)

• Flammability Rating UL 94V-0

APPLICATIONs

• Multi-Process Control Loops

• Fire & Security Systems

• Petro-Chemical Plants

• Refineries & Tank Farms

420LB

420LE