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Description
MAJ MT312RCD ELCB Loop & Polarity Tester, Voltage Indication: 25V~264VAC, RCD Test Voltage: 230VAC, Freq: 50 60Hz, Trip Current Setting: 10mA, 20mA , 30mA, NCV: Bar Graph Display & Buzzer Alert, 136x75x31mm RCD ELCB Loop & Polarity Tester Overview The MT312 is a compact, versatile tester designed for 3 wire AC circuits, supporting ELCB RCD testing, loop impedance measurement, and polarity verification. It features a Non Contact Voltage (NCV) function for safe
RCD/ ELCB Loop & Polarity Tester, Voltage Indication:25V~264VAC, RCD Test Voltage:230VAC, Freq:50/60Hz, Trip Current Setting:10mA, 20mA , 30mA, NCV:Bar Graph Display & Buzzer Alert, 136x75x31mm
RCD/ ELCB Loop & Polarity Tester
Overview
The MT312 is a compact, versatile tester designed for 3-wire AC circuits, supporting ELCB/RCD testing, loop impedance measurement, and polarity verification. It features a Non-Contact Voltage (NCV) function for safe AC voltage detection and displays wiring status clearly on a large, easy-to-read LCD screen. Voltage measurements between Live and Neutral, as well as Neutral and Earth, are shown directly on the display. The MT312 automatically performs loop impedance testing to verify correct wiring, with intuitive LED indicators: Green for Good, Orange for Check Circuit, and Red for Urgent Check, highlighting any potential faults. During ELCB/RCD testing, the device measures fault trip times up to 99.9ms, with a 10-second buzzer alert confirming a successful trip. A key feature of the MT312 is its interchangeable leads, enabling testing of standard power outlets with the included test leads or distribution boards using the optional MT350L test lead set.
Features
- Compact, versatile tester for 3-wire AC circuits
- Performs ELCB/RCD testing, loop impedance measurement, and polarity verification
- Non-Contact Voltage (NCV) function for safe AC voltage detection
- Clear LED & LCD display for wiring status and voltage readings
- Measures voltage between Live-Neutral and Neutral-Earth directly on the display
- Fault Trip Time: 99.9ms max, with 10-second buzzer alert on ELCB trip
- Automatic loop impedance testing to verify correct wiring
- Interchangeable leads - Perform measurements at a socket or distribution board (MT350L Optional lead for distribution boards)
- LED indicators for wiring status:
- Green – Good (Resistance < 1.8Ω)
- Orange – Check (Resistance between 1.8Ω & 92Ω)
- Red – Urgent Check (Resistance > 92Ω)
Specifications
|
Function |
Range |
|
Voltage Indication |
25V to 264V AC |
|
RCD Test Voltage |
230V AC |
|
Frequency |
50/60Hz |
|
Trip Current Setting |
10mA, 20mA, 30mA |
|
Fault Trip Time |
99.9ms max. Buzzer alert for 10 seconds when ELCB trips |
|
Loop Impedance Wiring Indication |
Green – Good (Resistance <1.8Ω)
Orange – Check (Resistance Between 1.8Ω & 92Ω)
Red - Urgent Check (Resistance >92Ω) |
|
NCV |
Bar graph display & Buzzer alert |
|
Auto Power Off |
5 Minutes (Approx) |
|
Display |
LED & LCD |
|
Batteries |
2x AAA |
|
Dimensions |
136 x 75 x 31mm |
|
Weight |
185g |
Downloads
Additional Information
| Device | Tester |
| Type | RCD/ ELCB | Loop & Polarity |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 18 reviews
Sort
Product Reviews
★★★★★ 5
Durable
Color: S6-muti-color
The balls are great for chewers. The squeaky didn’t last long but they are perfect for the ball launcher.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
★★★★★ 4
The squeeker isn't durable, but the balls themselves are.
Color: S6-muti-color, Color: S6-muti-color
I have two 70+lb, ball obsessed dogs (a field bred Golden Retriever, and an Old Time Scotch Collie), and these balls are living up to the abuse they're receiving.
In the fall we always lose a ball or two in the yard due to getting lost in leaves or longer grass, so I always try and buy a multi pack at the start of the season, so went with these this year. I'm glad I did. Great price for a 6 pack, they fit the medium Chuck-It launcher (a little loosely, but they throw just fine), have great bounce, they FLOAT (which means I didn't lose any at the beach), and they're super durable to the dreaded "mouth squish." The squeaker dies pretty quick, like, within a day, but it isn't the kind that can fall out or choke your dog, so no worries there.
The boys are happy, I'm happy, my wallet is happy - I've already ordered another pack.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 2, 2024
★★★★★ 5
Good balls
Color: S6-glow
My dog is a chewer, and these have held up for close to a year actually a pretty good product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
★★★★★ 3
Disappointed
Color: S6-muti-color
These were great for about 20 minutes then they stopped squeaking...we have 2 left that I have saved but the other 4 do not squeak anymore...disappointed as my dog loves to squeak things...would not buy these again...My dog is only an 8lb dog too...but he can still play with the balls without the squeak...
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
★★★★★ 5
Great Value for a ball my dog loves!
Color: S6-muti-color
I wish these ball were in the subscription program! My dog gets sooo excited by the new ball, but her interest in things lasts for a few days. She kills the squeak within 11minutes, but the squeaker stays in place rather than becoming a chocking or swallow hazard, and she still loves to chew it. Next, we must throw the ball approximately 723 times the first day, possibly 496 times on day 2, and just 3- 4 on day 3, at which point she will chase the ball before hollering "it's over here if you need it," while she checks on the chipmunk den. We currently have 17 of these balls in our yard (because we have given several leftovers to a less discriminating doodle next door). These balls hold up really well, get her extremely active for the first couple of days, and are a much cheaper than doggie daycare (after an active morning with a new ball, she is happy to chew on it and sleep much of the day). I always have these on hand!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 22, 2025
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