Wago Terminals, Connectors and I/O, New Zealand

RFQ / Wago

Wago part numbers are two groups of digits with a dash. 750-1405 is an I/O module, 2002-1201 is a terminal block and 221-413 is a lever connector. The first group tells you which product world you are in, and that is most of the way to identifying an unlabelled part.

Wago is on panels across New Zealand in two quite separate roles: the terminals and connectors that wire everything together, and the 750 I/O system that a lot of machines use instead of a conventional PLC rack.

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Reference pages

Page	Covers
750 series I/O	Couplers against controllers, how the module numbers decode, why module order is the addressing, the mandatory end module, field supply segmentation and the SD card that holds the program

The number groups

Starts with	What it is
750 or 753	I/O system. Couplers, controllers and modules
2000 to 2016	TOPJOB S rail mounted terminal blocks
280, 281, 282, 264	Earlier CAGE CLAMP terminal blocks
221, 222, 224	Lever connectors
773, 2273	Push-wire connectors
787	EPSITRON power supplies
788	Relay and optocoupler modules
857	Signal conditioners and isolators
769, 231, 232	Pluggable connectors
793, 209, 210	Markers, jumpers, end plates and accessories

So a number starting 750 is a machine control question and a number starting 2002 is a panel wiring question. Those are different conversations and we quote them differently.

Terminal blocks: the generation matters

Worth understanding before ordering into an existing rail.

Generation	Notes
TOPJOB S, 2000 series	Current. Push-in spring connection
280, 281, 282 and similar	Earlier CAGE CLAMP, operated with a screwdriver
264, 260, 261	Other earlier ranges

These do not mix on a rail. Widths differ, jumper bars differ, end plates differ and the marking carriers differ. So adding a terminal to an existing run means matching the generation, not just the wire size.

Jumper bars and end plates are separate parts, and they are the ones people forget. A run of terminals without its end plate and end stop is not finished, and the jumper that links a group of terminals is ordered by the number of positions it spans.

Markers are separate again, and are ordered as strips to suit that terminal family.

Send us a photo of the rail with the enquiry. It shows the generation, the width and what accessories are in use, which is faster than describing it.

Lever connectors are a commodity worth stocking

The 221 and 222 lever connectors are the small transparent blocks used to join conductors without a terminal rail. They come in two, three and five conductor versions and in a few conductor size ranges.

Point	Detail
Conductor count	The last digit indicates how many conductors
Conductor size range	Different series suit different cross sections
221 against 222	221 is the compact later range
Mounting carriers	Separate parts, for fixing them down

These are cheap, used everywhere and worth having in a drawer. We supply them in boxes and we are happy to add them to any other order.

Power supplies and signal conditioners

Family	What it does
787 EPSITRON	DIN rail 24 V power supplies, in several performance classes
787 buffer and redundancy modules	Ride through short supply dips, or run two supplies in parallel
857 JUMPFLEX	Signal isolators, converters and conditioners
788	Relay and optocoupler interface modules

A note on power supply sizing

A 24 V supply that has been working for years and starts causing odd faults is often loaded closer to its limit than anyone realises, because devices get added to a panel over time and nobody recalculates.

The symptom is not usually a dead supply. It is intermittent resets, a contactor that will not pull in when several coils energise together, or an I/O node dropping off under load.

So on a panel with unexplained intermittent behaviour, measure the 24 V rail under full load rather than at rest. That is free and it is frequently the answer.

Buffer modules are worth knowing about where a plant has brief supply dips. They hold the 24 V rail up through an interruption, which stops a controller resetting every time a large motor starts.

Signal isolators solve earthing problems

Worth flagging, because it connects to a problem that appears elsewhere on this site.

A signal isolator breaks the electrical connection between a field signal and the control system while passing the measurement.

Problem	An isolator helps because
Analogue signal noisy or drifting	It removes the earth loop carrying the noise
Readings shift when a drive runs	Same
Long cable run between buildings	Different earth potentials no longer matter
Signal needs converting	Current to voltage, or rescaling

So an instrument reading erratically may need an isolator rather than a new instrument. That is a much smaller order, and it fixes the cause rather than replacing the victim.

Same underlying issue as the earthing note on our flow meter page.

The 750 system is a PLC, or it is not

The distinction that matters most on this brand, covered fully on the 750 I/O page.

	Fieldbus coupler	Controller
Runs a program	No	Yes
Needs a PLC elsewhere	Yes	No
What it is	Remote I/O on a network	The machine's controller

They sit in the same position at the left end of a node and they look broadly similar. One is dumb I/O and the other holds the machine's logic.

So establish which you have before ordering. If it is a controller, the program is the thing that matters and the hardware is secondary.

Before ordering

Symptom	Check first
Panel resets intermittently	The 24 V rail measured under full load
Analogue reading noisy	Earthing, and whether an isolator would fix it
New terminal will not fit the rail	Terminal generation, not wire size
I/O node not communicating	End module, addressing and the network
Machine logic gone after a swap	It was a controller, not a coupler
Contactors chatter when several pull in	Control supply capacity

What to send us

The full part number, both groups of digits.

A photo of the rail or the node, which shows the generation, the accessories and the module order.

For terminals, the conductor size and how many you need, plus whether you want jumpers, end plates and markers.

For I/O, whether the left hand unit is a coupler or a controller.

For a power supply, the load and whether the panel has grown since it was fitted.

What we can supply

Terminal blocks. TOPJOB S and the earlier CAGE CLAMP ranges, with jumpers, end plates, end stops and markers.

Connectors. 221 and 222 lever connectors, push-wire connectors and mounting carriers.

I/O. 750 and 753 couplers, controllers and modules, including obsolete generations.

Power. EPSITRON supplies, buffer and redundancy modules.

Interface. JUMPFLEX signal conditioners and isolators, relay and optocoupler modules.

Accessories. The small parts that finish a job: end plates, jumper bars, marking strips and test plugs.

We buy Wago

750 I/O resells well, particularly couplers, controllers and less common module types from stripped panels.

Keep nodes together with their coupler and end module, and keep any SD card with the controller it came from. A complete node is worth considerably more than loose modules. See Sell To Us.

Common questions

Can you get a part that is not listed on your site?
Usually. The site shows what we hold, not what we can source.

Can I add a new terminal to an old rail?
Only if it is the same generation. Widths, jumpers and end plates differ between them.

Do jumpers and end plates come with the terminals?
No. They are separate parts and they are the usual omission.

Is my 750 unit a PLC?
Depends whether it is a coupler or a controller. A controller runs the machine's program.

My panel resets occasionally.
Measure the 24 V rail under full load before replacing anything.

Do you supply used equipment?
Yes on I/O, tested before it ships. Terminals and connectors we supply new.

What is the lead time?
Ex stock items ship the next working day within New Zealand. We give you a firm lead time with the quote.

Do you quote in NZD?
Yes, in NZD including GST for New Zealand customers.

Send us your part numbers

Both groups of digits, and a photo of the rail or node if you can. The first group tells us which product we are looking at and the photo tells us everything else. Quotes in NZD including GST.

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Industech is an independent supplier of new, surplus and used industrial automation equipment. We are not an authorised distributor of, approved by, sanctioned by, or affiliated with Wago. Wago, CAGE CLAMP, TOPJOB S, EPSITRON and JUMPFLEX are trademarks of Wago GmbH & Co KG. All trademarks, brand names and part numbers are the property of their respective owners and are used here for identification purposes only.