Junction Box
M12 sensor junction boxes gather four, six, eight or ten sensors onto a single shielded homerun cable back to the panel — less wiring, fewer terminals, faster fault-finding. Industrypapa stocks the VoxinTech VXT-JB range in 4, 6, 8 and 10 port versions with 2 m, 5 m and 10 m PVC leads, invoiced with GST and delivered pan-India.
What a sensor junction box does
On a machine with a dozen proximity or photoelectric sensors, wiring each one individually back to the PLC means a dozen cable runs through the drag chain and a dozen terminal sets in the panel. A junction box replaces that with one multi-core homerun: each sensor plugs into an M12 port on the box with a short cordset, and a single cable carries every signal back.
The practical gains are the ones maintenance teams notice. A failed sensor is unplugged and swapped without touching the panel. The wiring is documented by the port number rather than by wire colour. And the cable count through the moving parts of the machine drops sharply, which is where most intermittent faults begin.
The range in stock
| Part number | Ports | Homerun cable |
|---|---|---|
| VXT-JB-M12-04D-02M | 4 port | 2 m |
| VXT-JB-M12-04D-05M | 4 port | 5 m |
| VXT-JB-M12-04D-10M | 4 port | 10 m |
| VXT-JB-M12-06D-02M | 6 port | 2 m |
| VXT-JB-M12-06D-05M | 6 port | 5 m |
| VXT-JB-M12-06D-10M | 6 port | 10 m PVC |
| VXT-JB-M12-08D-02M | 8 port | 2 m |
| VXT-JB-M12-08D-05M | 8 port | 5 m |
| VXT-JB-M12-08D-10M | 8 port | 10 m PVC |
| VXT-JB-M12-10D-02M | 10 port | 2 m |
| VXT-JB-M12-10D-05M | 10 port | 5 m |
| VXT-JB-M12-10D-10M | 10 port | 10 m PVC |
The code reads straightforwardly: VXT-JB-M12 is the family and connector thread, 04D / 06D / 08D / 10D is the number of M12 ports, and the trailing 02M / 05M / 10M is the length of the fixed homerun cable. Choose the homerun length by the distance from the machine to the panel, and the port count by the number of sensors plus at least one spare.
Specifying a junction box
Count the ports properly
Add up the sensors on that section of the machine and go one size up. A spare port costs very little now and saves rewiring the whole box when a sensor is added later.
Measure the homerun
The cable is fixed, not field-terminated, so the length has to be right. Measure the real route through the drag chain and trunking, not the straight line.
Check the sensor outputs
All the sensors on one box should share the same output type. Mixing PNP and NPN devices on a single multi-core is the most common wiring mistake we are asked about.
Mind the mounting
Position the box where a technician can reach every port without removing a guard, otherwise the maintenance benefit disappears.
Buying M12 junction boxes in India
Industrypapa supplies sensor junction boxes to machine builders, packaging lines, pharma plants and maintenance teams across India. Because a junction box is almost always bought alongside the cordsets that plug into it, we are happy to quote the complete assembly — box, cables and sensors — on one GST invoice, delivered pan-India.
Related ranges: M8 and M12 connector cables, inductive proximity sensors, photoelectric sensors, mounting brackets and the full VoxinTech range. For anything not listed, send us the part number.
Frequently asked questions
What is a sensor junction box used for?
It collects several M12 sensors onto one multi-core cable running back to the control panel, replacing individual cable runs and terminal sets with a single homerun.
How many sensors can one box take?
Four, six, eight or ten, depending on the model. Specify by the number of sensors on that part of the machine plus a spare port for future additions.
Can I mix PNP and NPN sensors on one box?
No. Every sensor on a box shares the same supply and return, so they must all be the same output type and match what the PLC input card expects.
Do the cordsets come with the box?
The homerun cable is fixed to the box; the short leads from each sensor to the ports are ordered separately. Tell us the sensor threads and distances and we will quote the set together.
