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ABB 444781-210747 1NO Modular Contact Block for Pushbutton Stations
The ABB 444781-210747 is a rear-mounted modular contact block engineered for use with compatible ABB pushbutton and pilot-device control stations. Featuring a single normally-open (1NO) contact configuration, this block mounts to the rear of the control device housing, letting electricians and panel builders add switching capacity to a control circuit without redesigning the entire station. It ships packaged 1 each, making it a practical choice for expanding an existing modular control assembly or keeping a replacement contact block on hand for maintenance work.
Key Features
- Contact Configuration: 1NO (one normally-open) contact for straightforward control-circuit switching in pushbutton and pilot-device stations.
- Rear-Mounted Design: Mounts to the rear of compatible ABB modular pushbutton and pilot-device housings for a compact, integrated assembly that keeps the front-of-panel footprint unchanged.
- Modular Construction: Snaps into modular control-station platforms, simplifying customization of contact count and configuration as well as field servicing.
- Individual Packaging: Supplied 1 each, ideal for adding a single contact to an existing station or stocking a replacement for maintenance.
- Field-Serviceable: The rear-mount, modular format lets technicians add, remove, or replace the contact block without disturbing the rest of the control station wiring.
Technical Specifications
- Contact Configuration: 1NO
- Mounting: Rear Mounted
- Packaging: 1 ea
Typical Applications
- Industrial Control Panels
- Pushbutton and Pilot-Device Stations
- Machine and Equipment Control Circuits
- OEM Panel Assembly
- Panel Retrofits and Replacement Maintenance
- Modular Control-Station Expansion
Why ABB?
ABB modular contact blocks are built for dependable integration into control-station assemblies, giving panel builders and maintenance teams a consistent, drop-in way to add 1NO switching to their control circuits. The rear-mounted, modular design supports quick assembly and straightforward servicing, helping keep control panels organized, easy to expand, and easy to maintain over the life of the equipment. For teams standardizing on ABB modular control platforms, this contact block offers a compatible, purpose-built way to extend station functionality without introducing non-standard hardware into the panel.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Contact Block
- Configuration:
- 1NO Rear-Mounted
- Department:
- Electrical
- Product Group:
- Motor Control & Automation
- Product Subgroup:
- Push Buttons & Pilot Devices
ABB MCB-01B – Frequently Asked Questions
1) Does the ABB MCB modular contact block come in a normally closed version, or only normally open?
Both are offered. The 1 N.O. (normally open) block is MCB-10B and the 1 N.C. (normally closed) block is MCB-01B. Pick the N.O. block for a start-type circuit that closes when the button is pressed, and the N.C. block for a stop or interlock circuit that opens on actuation. Contact configuration is the only thing that changes between the two.
2) Can I put a Square D ZB2BE101 contact block on an ABB pushbutton station?
Treat them as separate platforms. The ZB2BE101 is a Harmony XAC add-on block, designed to mount to Square D Harmony control-station bodies. The ABB 444781-210747 is a modular block that snaps into ABB modular control-station platforms from the rear of the housing. If the station body in the panel is ABB, order the ABB block (MCB-10B for 1 N.O., MCB-01B for 1 N.C.) so you are not mixing mounting interfaces inside the enclosure.
3) What is the closest equivalent to the ABB 444781-210747 1NO contact block from another manufacturer?
The Square D Harmony XAC add-on contact block ZB2BE101 carries the same 1 NO contact configuration and is built as an add-on block for pushbutton and pilot-device stations, with screw clamp terminals. The ABB block is a rear-mounted modular block that snaps onto compatible ABB pushbutton and pilot-device housings. Contact blocks are platform-specific, so the Square D unit belongs on a Harmony XAC station and the ABB unit on an ABB modular station - they match on function, not on mounting interface.
4) I need a normally-closed contact instead of normally-open - what should I order?
Order the MCB-01B variant of the ABB modular contact block, which is the 1 N.C. contact configuration; MCB-10B is the 1 N.O. version. Both are the same rear-mounted modular format for ABB pushbutton and pilot-device stations, so the physical mounting and panel footprint are identical - only the contact state changes. The Square D Harmony XAC ZB2BE101 add-on block is a 1 NO device and is not the part to use when you need a normally-closed contact.
5) Can I add this contact block to an existing pushbutton station without rewiring the whole panel?
That is what the modular format is for. The block snaps into the control-station platform at the rear, so a technician can add, remove, or replace it without disturbing the rest of the station wiring. It is a common move on panel retrofits where a circuit needs one more contact and the operator itself is staying put.
6) I need both a start and a stop contact on one pushbutton station. Can I stack ABB MCB blocks?
Yes, within the limits of your operator housing. The blocks are single-contact modules, so contact count is built up by adding them to the station platform. Order one MCB-10B for the normally open start contact and one MCB-01B for the normally closed stop contact. The modular design is intended for exactly this kind of contact-count customization.
7) How many contact blocks do I get when I order one ABB MCB-10B?
One. These ship packaged 1 each, not in a multi-pack. If you are building a station that needs two N.O. and one N.C., order three separate blocks. Buying singles is also how most maintenance shops keep a spare on the shelf without overstocking.
8) Is the ABB MCB contact block suitable for OEM machine control panels?
It is aimed at industrial control panels, machine and equipment control circuits, OEM panel assembly, and panel retrofit or replacement maintenance work. For a shop already standardized on ABB modular control platforms, it keeps the contact hardware consistent across builds rather than introducing a second platform into the panel.
9) Does the ABB 444781-210747 use screw terminals like the Square D add-on block?
The Square D Harmony XAC ZB2BE101 is specified with a screw clamp terminal. For the ABB modular block, confirm termination against the ABB spec sheet before you commit the wire prep on a panel build - what the ABB block is defined by is its 1NO rear-mounted modular configuration, snapping into compatible ABB station housings without changing the front-of-panel footprint.
How fast can I get the ABB MCB-01B delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the ABB MCB-01B come with a warranty?
Absolutely. The ABB MCB-01B is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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