420LE28 Datasheet, PDF (1/3 Pages) Protek Devices – TWO LINE PAIR 4-20mA CONTROL LOOP PROTECTOR

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
www.protekdevices.com