Klein Tools RT250 GFCI Receptacle Tester

Product Overview

The RT250 is an electrical circuit tester designed for North American 120V electrical outlets. It tests wiring conditions and inspects GFCI (Ground Fault Circuit Interrupter) devices. The tester features an LCD display that shows voltage, wiring faults, and GFCI trip time.

General Specifications

• Operating Altitude: 6562 ft. (2000m)
• Relative Humidity: <85% non-condensing
• Operating Temp: 32° to 122°F (0° to 50°C)
• Storage Temp: -4° to 140°F (-20° to 60°C)
• Dimensions: 4.5" x 2.0" x 1.3" (114 x 50 x 33 mm)
• Weight: 4.8 oz. (136 g) including batteries
• Battery Type: 2 x 1.5V AAA Alkaline
• Standards: Conforms to UL STD.61010-1, 61010-2-030, 1436; Certified to CSA STD C22.2 #61010-1, 61010-2-030, 160
• Pollution degree: 2
• Drop Protection: 6.6 ft. (2m)
• Safety Rating: CAT II 135V

CAT II: Measurement Category II is applicable to test and measuring circuits connected directly to utilization points (socket outlets and similar points) of the low-voltage MAINS installation.

Specifications subject to change.

Warnings

To ensure safe operation and service of the tester, follow these instructions. Failure to observe these warnings can result in severe injury or death.

• RT250 is designed for use with North American 120V electrical outlets. DO NOT connect to higher voltage electrical supplies.
• Prior to use, always verify tester operation by testing on a known live and correctly wired electrical circuit.
• DO NOT use if the tester appears damaged in any way.
• The tester is intended for indoor use only.
• Other equipment or devices attached to the circuit being tested could interfere with the tester. Clear the circuit before testing.
• This tester only detects common wiring problems. Always consult a qualified electrician to resolve wiring problems.
• DO NOT attempt GFCI ground fault testing on an incorrectly wired circuit. Consult a qualified electrician to resolve wiring problems.
• For use on 3-wire outlets only.

Operating Instructions

Power ON/OFF

Press and hold the power button (1) for two seconds to power ON/OFF the tester. When the tester is powered ON and not connected to a circuit, the LCD (3) will display "000" (A) and "Open Hot" (B) condition. The tester automatically powers OFF after 3 minutes of inactivity to conserve battery life.

Wiring Condition

Prior to use, always verify tester operation by testing on a known live and correctly wired electrical outlet.

With the tester powered ON and inserted into the outlet, the Hazardous Voltage Indicator (F) will appear, and the red or green Indicator LED(s) (4) will illuminate. If the red indicator LED illuminates, unplug the tester to read voltage (A) and wiring fault (B). The tester holds the information on the LCD, and the Hold Mode indicator (D) will illuminate. During this time, the LCD will blink. The LCD will reset once it is plugged into another circuit, or if no voltage is detected, the LCD will blink during the time-out period prior to auto-power off.

If the tester indicates that the circuit is not wired correctly, consult a qualified electrician.

Note: Conditions NOT indicated include, but are not limited to, quality of ground, multiple hot wires, reversal of neutral and ground conductors, and combinations of defects other than dual open neutral and ground.

Note: All appliances or equipment on the circuit being tested should be unplugged to help reduce the possibility of erroneous readings.

Wiring Condition Table

*Expected voltage reading on LCD based on the indicated wiring condition.

Note: If the detected voltage is either low (30–85V AC) or high (135–150V AC), the red LED will illuminate. It is possible to have the red LED (indicating low or high voltage) and the green LED (indicating correct wiring) illuminated simultaneously.

GFCI Ground Fault Testing

Note: Prior to using this tester, check the GFCI device's user manual for information on how the specific device operates.

Power ON the tester (1) and insert the plug into the outlet of the circuit under test. On a properly wired circuit, the green Indicator LED (4), the Hazardous Voltage Indicator (F), and the Correct Wiring Indicator (G) will illuminate.

⚠️ If the tester indicates that the circuit is not wired correctly, DO NOT attempt to initiate an electrical testing event. Consult a qualified electrician.

To initiate an electrical fault, press the GFCI button (2). The tester will create a 6mA to 9mA ground fault to trip the GFCI device. If successful, the display will toggle between the pre-test voltage and time to trip the breaker. If the circuit remains energized, or if ">6 sec" appears on the LCD, the device being tested may be miswired, may not be installed correctly, or may not be functioning correctly. Consult a qualified electrician.

Battery Replacement

When the Low Battery Indicator (E) illuminates, replace the batteries.

1. Loosen screw from battery cover (5).
2. Replace 2 x AAA batteries (note proper polarity).
3. Replace battery door and fasten securely with screw.

⚠️ To avoid risk of electric shock, unplug from any voltage source before removing battery door.

⚠️ To avoid risk of electric shock, do not operate tester while battery door is removed.

Cleaning and Storage

Cleaning

Ensure the tester is turned off and wipe with a clean, dry lint-free cloth. Do not use abrasive cleaners or solvents.

Storage

Remove the batteries when the tester is not in use for a prolonged period. Do not expose to high temperatures or humidity. After a period of storage in extreme conditions exceeding the limits mentioned in the General Specifications section, allow the tester to return to normal operating conditions before using.

Warranty and Disposal

Warranty

For warranty information, visit: www.kleintools.com/warranty

Disposal / Recycle

Do not place equipment and its accessories in the trash. Items must be properly disposed of in accordance with local regulations. Please see www.epa.gov or www.erecycle.org for additional information.

Customer Service

KLEIN TOOLS, INC.
450 Bond Street
Lincolnshire, IL 60069
Phone: 1-800-553-4676
Email: customerservice@kleintools.com
Website: www.kleintools.com