Rittal TS8 vs AX Enclosures: A Quality Inspector's FAQ on Power Supplies, Crimping Connectors, and Blood Pressure Monitor Kiosks

If you're here, you're probably comparing Rittal TS8 enclosures to Rittal AX enclosures, trying to figure out where a power supply is going to live, or looking up how to crimp connectors without making a mess. I see these questions a lot. I'm a quality and brand compliance manager at an industrial assembly company. I review roughly 200 enclosures and wiring assemblies a year, and in 2024 I rejected about eight percent of first deliveries—usually for something small and avoidable. This FAQ is the conversation I'd have over the phone: direct, practical, and with inspection caveats included.

Here's what we'll cover:

• TS8 vs AX: which one do you actually need?
• Power supply heat inside the enclosure
• Ordering a single enclosure without being treated like a nuisance
• How to crimp connectors so they pass inspection
• A blood pressure monitor kiosk and the enclosure rules that apply
• The humidity question nobody asks until after installation

What's the difference between Rittal TS8 enclosures and Rittal AX enclosures?

Think of TS8 as the modular workhorse and AX as the smaller, faster cabinet. TS8 is built around a rigid frame with a 25 mm mounting grid. It's the system I'd choose for a multi-door machine control panel, a process cabinet with heavy DIN-rail components, or an installation that needs to grow. AX is the compact enclosure for smaller controls, field distribution, and wall-mounted boxes. If you need room for a PLC, a few relays, and a power supply, AX is often enough. If you need contactors, VFDs, terminals, cable ducts, and space for a person to wire it comfortably, start with TS8.

I use both, and I do not mean one is better. They overlap in some sizes. The practical difference is modularity and load capacity. TS8 gives you a whole ecosystem of mounting rails, mounting plates, gland plates, busbar systems, and climate accessories. AX gives you a clean, standardized box without the extra footprint. As of January 2025, Rittal's published product data (rittal.com) lists both systems with different IP protection levels, depending on the door, gland plates, and seals you specify. Don't assume the empty box is sealed. The sealing is a system, not a default.

Should I worry about heat from a power supply inside an enclosure?

Yes. And more than you think. A typical 24 V DIN-rail power supply is not 100% efficient. The wasted energy becomes heat. Put a 240 W supply inside a sealed cabinet, and that cabinet becomes a small oven if you have no ventilation or cooling.

I don't have hard data on every brand's efficiency curve, but in Q4 2024 we tested two supplies with the same DC output in the same TS8 enclosure. The lower-efficiency unit raised the internal air temperature about 5°C more than the higher-efficiency model at full load. That matters for capacitors, displays, and any nearby device—including a blood pressure monitor in a telemedicine kiosk.

The practical rule is simple: calculate the total power that will be dissipated inside the enclosure, not the nameplate power of the supply. Then add the ambient temperature. If you're not sure whether you need a fan, filter, heat exchanger, or air conditioner, start with the total heat load in watts. From a quality standpoint, I'd rather see a slightly oversized cooling solution than a locked cabinet that reaches 55°C by week three.

I only need one enclosure. Is that a problem?

No. Small orders make up a surprising amount of the work I review. Vendors who treat a one-off seriously are the ones I trust later with larger projects. If you're comparing Rittal AX or TS8 for a prototype, a single unit is normal. Rittal sells through distributors, and you can order one enclosure without opening a big account.

The trap is the missing option list. A standard enclosure cannot include every option automatically. The mounting plate, DIN rail, gland plates, and door lock configuration are usually separate choices. With a single-unit order, one missed line item can delay the whole build. In our 2024 intake, about 12% of first deliveries were missing at least one option. The most common? A mounting plate. It's an easy fix, but it still means a week of waiting.

So my advice: ask the distributor for a kitted part number, or give them a complete BOM before you order. Small doesn't mean unimportant. It means potential.

How to crimp connectors so they pass inspection

This is the question I get from engineers and makers. Here's the short version: use the right tool, strip the wire to the right length, and make sure the barrel crimps around the conductor, not the insulation.

What most people don't realize is that a proper crimp doesn't need solder. Solder on a crimped power connector can make the joint brittle in a vibrating panel, and hidden voids are hard to see. For ferrules on stranded wire, use a ferrule crimper with the correct jaw. For insulated disconnects, use the notch that matches the connector color. For larger contacts, follow the manufacturer's die chart. I don't care if the tool costs $40 or $400—I care that the result passes a pull test and a visual check.

The things we actually reject: nicked strands, insulation caught under the barrel, stray strands sticking out, and a crimp indentation that is off-center. A ratchet crimper helps because it won't release until you finish the cycle. Hand crimpers are fine for occasional sensor wires, but they let you stop halfway, and halfway is where bad connections are born.

Can I use Rittal AX for a blood pressure monitor kiosk?

Yes, with caveats. A wall-mounted AX can house a blood pressure monitor, its power supply, and the small wiring hub for a telemedicine or self-check kiosk. You need to plan for ventilation, cable entry, and service access. In a kiosk project we reviewed last year, the team used a small AX with a transparent door, a low-noise fan, and a filtered intake grille. The monitor display stayed readable without opening the cabinet.

The bigger issue is heat and cable strain. If the power supply sits directly under the monitor and both are in the same sealed box, the sensor electronics can drift. Leave a few centimeters of clearance, mount the supply on a DIN rail or side panel, and make sure the arm cuff cable passes through a strain-relief gland. If a patient pulls the cuff, the connector on the board inside shouldn't move.

IP rating also matters. For clinic hallways and dust, choose at least IP54 (per IEC 60529) with the specified gland plates. And before anyone asks, an enclosure alone doesn't make the device medically certified. I'm not a compliance engineer, so I won't pretend to interpret IEC 60601. From a quality inspector's side, the enclosure work is straightforward: grounded metal housing, protected connections, clean labels, and no sharp edges. The medical certification is a separate lane.

What do quality inspectors actually reject on delivery?

In my pile, the usual defects are nicked conductors, missing gland plates, components mounted too close to a door or cover, poor grounding continuity, and doors that don't line up after internal equipment is installed.

The grounding one surprises people. A TS8 door has a grounding point, and the door bond is often the only thing separating a safe panel from a legal headache. We verify frame-to-door continuity on every unit. In 2024, we rejected one first article because the installer had not connected the door grounding strap. It was a five-minute fix, but it was exactly the five minutes that would have been missed without an inspection.

Another rejection: clearance. Someone mounted a filter fan so close to a DIN rail that the access cover could not be removed for maintenance. The drawing looked fine on paper; the physical layout did not. The fix was moving the fan, but it would have been cheaper to dry-fit the parts before punching holes. This is why I like the TS8 pitch system for larger builds—it helps you place mounting plates and rails in a predictable grid. But even with a good enclosure, the quality comes from the person doing the final check.

Is a sealed IP enclosure always safe from humidity?

I wish someone had told me this earlier: a sealed enclosure is not automatically dry. Condensation happens when the air inside cools and hits a cold surface. In a workshop that feels normal, you can't see it until a connector rusts. On a cabinet with a power supply that runs at night and shuts down during the day, the temperature swing is exactly what creates moisture.

What we do now, especially for AX wall-mount cabinets in unheated pump rooms or outdoor kiosks, is add a small anti-condensation heater or a filtered breathing drain, depending on the IP rating needed. Or we leave a desiccant pack during shipping and remove it before commissioning. This sounds trivial, but corrosion on DIN-rail connections is one of those service failures that never shows up in functional testing. It shows up six months later.

If you want to avoid this, say the words condensation control to the distributor before you order. That way, at least, the question is on the table.