420LE28
thru
420LB60
1
05048.R3 11/03
www.protekdevices.com
TWO LINE PAIR 4-20mA CONTROL LOOP PROTECTOR
Only One Name Means ProTek'TionTM
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): 8/20s - 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.
05048
420LE
420LB
2
www.protekdevices.com
05048.R3 11/03
420LE28
thru
420LB60
DEVICE CHARACTERISTICS
INSTALLATION INSTRUCTIONS
There are five (5) terminals on the
LINE SIDE
and five (5) terminals on
the
EQUIPMENT SIDE
of the 420LE, 4 data lines and one ground. Both
grounds are connected together internally. A single low impedance is
ground sufficient. Incoming data lines are cut or disconnected from the
equipment to insert the 420LE/B products. The incoming lines are to be
connected to the line side terminals as the equipment side lines are
connected to the equipment side terminals. The location of the product
should be as close to the equipment as possible. The 420LE/B series is
designed with a short circuit failure mode to give maximum protection. A
fuse, fussable link, or circuit breaker is recommended for each data/
signal line on the input side for those that require an open circuit failure
mode.
Caution:
A low DC resistance ground may not be indicative of a good
lightning ground. Lightning contains a broad spectrum of frequencies up
to 1 MHz. A low impedance path to ground at the transient frequencies is
necessary. A ground strap is recommended or a #6 AWG stranded wire.
For wire lengths over 1.5 meters, there may be some excessive line to
earth potential under severe thunderstorm conditions.
28.0
35.0
60.0
28.0
35.0
60.0
PROTEK
PART
NUMBER
MAXIMUM
OPERATING
LINE VOLTAGE
V
OP
VOLTS
MAXIMUM
LEAKAGE
CURRENT
@ V
OP
I
D
A
MAXIMUM
CLAMPING
VOLTAGE
(8/20s)
@2,000A
V
C
VOLTS
MAXIMUM
CAPACITANCE
@ 0V, 1 MHz
C
pF
MAXIMUM
LINE THRUPUT
RESISTANCE
R
OHMS
40
60
85
40
60
85
5.0
5.0
5.0
5.0
5.0
5.0
420LE28
420LE35
420LE60
420LB28
420LB35
420LB60
2800
1500
1000
2800
1500
1000
12
12
12
12
12
12
ELECTRICAL CHARACTERISTICS @ 25
0
C Ambient Temperature
MAXIMUM RATINGS @ 25
0
C
Operating Line Current 100mA
Operating Temperature -55 to 100
0
C
Storage Temperature -55 to 100
0
C
Transient Source Voltage 6kV
Transient Current (8/20s) 10kA
3
www.protekdevices.com
05048.R3 11/03
420LE28
thru
420LB60
COPYRIGHT ProTek Devices 2003
SPECIFICATIONS: ProTek reserves the right to change the electrical and or mechanical characteristics described herein
without notice (except JEDEC).
DESIGN CHANGES: ProTek reserves the right to discontinue product lines without notice, and that the final judgement
concerning selection and specifications is the buyer's and that in furnishing engineering and technical assistance,
ProTek assumes no responsibility with respect to the selection or specifications of such products.
PACKAGE OUTLINE & DIMENSIONS
ProTek Devices
2929 South Fair Lane, Tempe, AZ 85282
Tel: 602-431-8101 Fax: 602-431-2288
E-Mail:
sales@protekdevices.com
Web Site:
www.protekdevices.com
EQUIPMENT
1
2
4
GND
3
2
1
4
GND
3
WARNING:
LINE
Mounting Hole for #8 Screw
2.25" MAX
(57.2mm)
1.19" MAX
(30.2mm)
#6 Screw
0.61" MAX
(15.5mm)
Adhesive Mylar Label
Terminal Screw
Terminal Strip
3.8" MAX
(96.5mm)
1.125"
(28.575mm)
420LE CASE OUTLINE
3.25"0.015"
(82.6mm0.38mm)
OUTPUT
5
4
3
2
3.8" MAX
(95.5mm)
3.0" MAX
(76.2mm)
1.9" MAX
(48.2mm)
0.30" MAX
(7.6mm)
0.07
(17.8mm)
GND
EQUIPMENT
2
5
LINE
Orientation Notch
CONTINUITY
INPUT
12
13
14
15
INPUT Connected to Lines
From Out Side World
OUTPUT Connected to
Transmit/Receiver Circuits
NOTE:
I/O contacts spaced at 0.156" (3.96 mm) centers
420LB BOARD OUTLINE
0.325" MAX
(8.25mm)
12
15
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