420LE 查看數據表（PDF） - Protek Devices

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420LE

TWO LINE PAIR 4-20mA CONTROL LOOP PROTECTOR

Protek Devices 

Only One Name Means ProTek’Tion™

420LE28

thru

420LB60

TWO LINE PAIR 4-20mA CONTROL LOOP PROTECTOR

APPLICATIONS

✔ Multi-Process Control Loops

✔ Fire & Security Systems

✔ Petro-Chemical Plants

✔ Refineries & Tank Farms

IEC COMPATIBILITY (EN61000-4)

✔ 61000-4-2 (ESD): Air - 15kV, Contact - 8kV

✔ 61000-4-4 (EFT): 40A - 5/50ns

✔ 61000-4-5 (Surge): 8/20µs - 95A, Level 4 (Line-Gnd) & 48A, Level 4 (Line-Line)

FEATURES

✔ 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

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

✔ Flammability Rating UL 94V-0

✔ Device Marking:

Case - Logo, Terminal Designations & Part Number

Board - Logo, Date Code & Part Number

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

interruption 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 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. 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.

420LB

420LE

05048.R3 11/03

1

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