420LE28 Datasheet, PDF (1/2 Pages) Protek Devices – TWO LINE PAIR 4-20mA CONTROL LOOP PROTECTOR

. . . engineered solutions for the transient environment™
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)
420LE PACKAGE
FEATURES
✔ Designed for 4-20mA Current Loops
✔ Automatic Reset - Will Not Interrupt Service
✔ Permanent Two-Stage Line Pair Protection
✔ Line-to-Ground (Common) & Line-to-Line (Differential) Protection
✔ Subnanosecond Response Time
✔ Effective Against Lightning, Inductive Switching & ESD
MECHANICAL CHARACTERISTICS
✔ Module Weight 160 grams (Approximate)
✔ Board Weight 32 grams (Approximate)
✔ Flammability Rating UL 94V-0
✔ Device Marking: Part Number, Logo, Date Code, and Terminal Designations for the LE Device
420LB BOARD
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 impor-
tant to maintain a low voltage clamp between the line-to-ground connection.
05048.R2 7/02
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