• Simple and convenient way to connect up to 8 CTs to the WebMeter36F™.
  • Ideal for connecting single and multiple phases or remote pieces of equipment to the WebMeter36F™.
  • Use up to five JBox-8s with one WebMeter36FT™ and/or combine them with JBox-12s.


CurrentTransformer wiring that originates from a breaker panel is considered a Class 1 circuit by both the National Electrical Code (NEC) and the Canadian Electrical Code (CEC).

JBoxes provide a convenient way to isolate CT wiring from class 2 devices such as CircuitMeter’s WebMeter36F™ product. Corrections to phase error and gain errors are performed by the WebMeter36F™.

This enables a flexible installation process utilizing standard CAT5 cables. The JBox-8 is an 8 port configuration allowing a single JBox-8 to connect up to 8 CTs to a WebMeter36F™.

Use any combination of JBox-4’s and JBox-8’s to connect a total of up to 36 CTs to a WebMeter36F™.  Use standard Cat5e cable to connect to a WebMeter36F™.

Supported Current Transformers from CircuitMeter

Solid Core CT040, CT100, CT200
Split Core SP040, SP100, SP200, SP400, SP600, SP800

Device Specifications

Isolation Input to Output 2.5 KV (hi-pot test)
Frequency 50/60 Hz


Supports 8 Current Transformers
Connector Type Spring Cage
CT Current 20 mA


RJ45 (T-568B) 2
CT Current 10 mA

Mechanical & Dimensions

Weight 0.36 kg (0.79 lbs)
Size 18.5 cm / 7.29 in (L)
12.0 cm / 4.72 in (W)
5.72 cm / 2.25 in (H)

Safety Certifications

Safety Standards UL 610010-1
CAN/CSA C22.2 No. 61010-1


Operating Temperature 0ºC to +70ºC
Storage Temperature -17ºC to +80ºC
Humidity 10 to 90% non-condensing
Enclosure UL94V-5VA

** Subject to Change Without Notice **

Additional information