®
®
. . . . . Engineered solutions for the transient environment
2929 South Fair Lane • Tempe, Arizona 85282 • USA
Tel 602-431-8101 • Fax 602-431-2288 • E-mail sales@protek-tvs.com • Web www.protek-tvs.com 1
420E212420E212
420E212420E212
420E212
thruthru
thruthru
thru
420E260420E260
420E260420E260
420E260
DUAL 4-20mA CONTROL LOOP PROTECTOR
APPLICATIONS
●Security Alarm Systems
●Industrial Control & Monitoring Systems
●Remote Tech Site Station
●Process Control Loops
FEATURES
●Meets IEC 1000-4-4 Level 4 Requirements
●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
DESCRIPTION
The 420E2 series of protection 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 420E2 series is designed to protect 4-20mA analog control loops from differential and common
mode transients. T erminals 1 and 2 are designated as the line pairs for both the line and equipment
side of the protector. A transient voltage suppressor is internally connected across each line
pair for differential mode protection.
This product can also be used on telephone, signal/data lines, security , timing and control interface
circuits.
5.0
5.0
5.0
5.0
5.0
5.0
22
44
46
60
80
95
12
12
12
12
12
12
6,000
3,000
2,800
1,500
1,200
1,000
PROTEK
PART
NUMBER
ELECTRICAL CHARACTERISTICS @ 25° C Ambient Temperature
MAXIMUM
CAPACITANCE
@ 0 V, 1 MHz
C
pF
MAXIMUM
CLAMPING
VOLTAGE
(8/20µs)
@ 2,000A
VC
VOLTS
MAXIMUM
LINE THRUPUT
RESISTANCE
R
OHMS
MAXIMUM
LEAKAGE
CURRENT
@ VOP
ID
µA
MAXIMUM
OPERATING
LINE VOLTAGE
VOP
±VOLTS
420E212
420E225
420E228
420E236
420E250
420E260
12.0
25.0
28.0
36.0
50.0
60.0
MAXIMUM RATINGS
●Operating Line Current: 100mA
●Operating & Storage Temperature: -55°C to +100°C
●Transient Source Voltage: 6kV
●Transient Current (8/20µs): 10kA per Line
●Approximate Weight: 160 grams
420E2 PACKAGE
®
2
There are two (2) terminals on the Line side and three (3) wires on
the Equipment side of this surge protection device (SPD). The
ground lead is considered ground for both the input terminal and
the equipment wire connections. For best results, the ground wire
should be connected to a low impedance ground or the green wire
AC power ground. It is recommended that a #14 stranded wire be
used for this connection.
Protectors should be installed at both ends of the loop to protect the
transmitter and receiver equipment.
Field (current) loops or incoming signal/data lines are to be cut or
disconnected from the equipment to insert the 420E2 SPD. The
Line side terminals of the protector are to be connected to the field
loop wires. The Equipment side of the protector are to be connected
to the protector/receiver/controller, etc. The location of the protector
should be as close as possible to the equipment requiring protection.
A #18 or 20 gauge wire can be used for this connection.
INSTALLATION INSTRUCTIONS
5053.R1 12/98
420E2 CASE OUTLINE
1.40” MAX
(35.56 mm) 2.50” MAX
(63.5 mm)
1.20” MAX
(30.48 mm)
LINE EQUIPMENT
1
GND
2
0.675” MAX
(17.15 mm)
1
GND
2
