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

µA

MAXIMUM

CLAMPING

VOLTAGE

(8/20µs)

@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

Operating Line Current

100mA

Operating Temperature

-55 to 100

Storage Temperature

-55 to 100

Transient Source Voltage

6kV

Transient Current (8/20µs)

10kA