• Timer: 0 to 9.999 sec, 1 ms resolution; 10.00 to 99.99 sec, 10 ms resolution, 100.00 to 999.999 sec, 100 ms resolution
• built-in Timer displays contact time in both cycles and milliseconds
• AC current source with 3 outputs (10A, 40A, 100A)
• Set of NO/NC dry contacts that change state when a test is initiated
• AC voltage source for testing relays up to 250 Vac
• DC Voltage source (0 - 300 Vdc)
• Volt meter input (0 - 600 V input range)
• Three power supplies (24 Vdc, 48 Vdc, 124 Vdc)
• Built-in power resistors

The RFD-200 S3 is a portable relay test set that delivers performance verification testing of electromechanical, electronic, and microprocessor-based protective relays in their operating installations. The RFD-200 S3 is a rugged test set suitable for testing a variety of protection relays operated in both indoor and outdoor environments. The unit’s ergonomic design and intuitive control panel layout make it ideal for first-time users who have little or no training.

Built-in Digital Timer

The RFD-200 S3’s digital timer features independent

start and stop trigger inputs designed to measure the

time between event transitions and to display the

elapsed time in both milli-seconds and cycles. The RFD-

200 S3’s timer has three different trigger inputs – Internal

Trigger, Dry-Contact, or Wet-Contact. The Internal

Trigger can start or stop the timer by sensing the application

or removal of the unit’s voltage or current source.

The Dry-Contact can trigger the timer by detecting a

change in state of the dry-contact input. Similarly, the

Wet-Contact can trigger the timer by detecting a change

in state of the voltage input. Thus, the three inputs can

trigger the timer by the presence or removal of the unit’s

voltage or current source or by changes in voltage or

current states.

AC Current Source

An AC current source with three outputs (10A, 40A,

and 100A) provides test current to relays. The current

source output can be programmed to synchronize with

the RFD-200 S3’s timer. After a test is completed, the

test current reading is latched and displayed on the LCD

screen. This feature reduces the possibility of overheating

the relay coils.

Auxiliary Output Contact

A set of NO/NC dry contacts change state when a test

is initiated.

AC Voltage Source

An AC voltage source is available for testing relays

up to 250 Vac. The AC voltage source output

can be programmed to synchronize with the

RFD 200 S3’s timer.

DC Voltage Source

A 0 – 300 Vdc voltage source is also available.

The DC voltage source can also be programmed

to synchronize with the RFD-200 S3’s timer.

Volt Meter

One volt meter input (0 to 600 V input range) is

available on the RFD-200 S3.

Ampere Meters

The test current is displayed on the unit’s backlit

LCD screen that is viewable in both bright

sunlight and low-light levels. The current measuring

range is from 0.00 to 250 A. A second

ampere meter is also available and can be used

to read an external current input. The external

current input is rated at 6 A max and is protected

by a circuit-breaker.

Auxiliary AC/DC Power

Supplies

The RFD-200 S3 provides three power supplies

(24 Vdc, 48 Vdc and 124 Vdc) for powering solidstate

or microprocessor-based relays.

Built-in Power Resistors

The RFD-200 S3 features built-in power resistors

for fi ne current adjustment.

Part number RFD-200 S3 RFD-200 S3 and cables

Part number RFD-200 S3 CASE RFD-200 S3 shipping case