Overview

420E Series

The 420E 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 interruption of service. The 420E series is designed to protect 4-20mA analog control loops from differential (line to line) and common mode (line to ground) transients. Terminals 1 and 2 are designated as line pairs for both the line and the equipment side of the protector. A transient voltage suppressor is internally connected across each line pair for differential 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.
Custom Module
Release Date: December 1, 1994
Rev. Date: September 13, 2012
Rev No.: 6

SERIES FEATURES

IEC 61000-4-2 (ESD): Air - 15kV, Contact - 8kV
IEC 61000-4-4 (EFT): 40A - 5/50ns
IEC 61000-4-5 (Surge): 8/20µs - 95A, 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

APPLICATIONS

Security Alarm Systems
Industrial Control & Monitoring Systems
Remote Tech Site Station
Process Control Loops

Electrical Characteristics

Safeguard Your Interface

Part Number Stand-off Voltage
VWM
Volts		 Clamping Voltage
VC
Volts		 Peak Current
IPP
Amps		 Leakage Current
IR
µA		 Resistance
Ohms		 Capacitance
C
pF		 Lines
420E12112.0022.00999.995.0012.00999.992
420E22525.0044.00999.995.0012.00999.992
420E22828.0046.00999.995.0012.00999.992
420E23636.0060.00999.995.0012.00999.992
420E25050.0080.00999.995.0012.00999.992
420E26060.0095.00999.995.0012.00999.992