ABB CA7-22U Auxiliary Contact Block

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Manufacturer: ABB
Product No.: CA7-22U
Country of origin:Sweden
Product Type: Auxiliary Contact Blocks
Barcode: 85371091
Payment: T/T, Western Union
Weight: 500g
Dimensions: 80 mm x 50 mm x 60 mm
Shipping port: Xiamen
Warranty: 12 months

Description

Engineered for seamless integration into industrial control architectures, the ABB CA7-22U provides reliable auxiliary contact feedback to monitor contactor state transitions. This front-mounted contact block features a highly dependable mechanical linkage that synchronizes precisely with the parent contactor's main poles. Constructed with robust industrial-grade housing, it is optimized to provide precise feedback signals to PLC inputs, safety interlock systems, and control circuit indicators under demanding operational conditions.

Key Features

Balanced Contact Configuration: Equipped with 2 Normally Open (NO) and 2 Normally Closed (NC) auxiliary contacts for flexible circuit design.
Snap-On Front Mounting: Easily installs directly onto the front of compatible contactors without requiring specialized tools or mounting hardware.
High-Integrity Control Feedback: Designed to offer low contact resistance and highly repeatable switching for safety interlocks and status signaling.
Compact Footprint: Standardized form factor minimizes panel depth utilization, allowing clean wire routing in crowded control enclosures.

Applications

Motor control center (MCC) starter assemblies and control panels.
Electrical interlocking systems for reversing contactors and star-delta starters.
State feedback signaling to PLC input modules and distributed control systems (DCS).
Auxiliary alarm and fault circuit activation in power distribution panels.

Technical Specifications

Parameter	Specification
Manufacturer	ABB
Model Number	CA7-22U
Product Type	Auxiliary Contact Block
Contact Arrangement	2 NO (Normally Open) + 2 NC (Normally Closed)
Mounting Method	Front Snap-On
Commodity Code	85371091
Shipping Weight (Calculated)	0.50 kg
Package Dimensions (Calculated)	80 mm x 50 mm x 60 mm

Empirical Engineering Insights

Alternative Models & Compatibility

Verify the physical mating interface of your main contactor frame before procurement. Ensure that the actuator mechanism aligns cleanly with the front-mounting guide rail of the contactor to prevent uneven mechanical wear on the auxiliary contact sliders.

Application Pitfalls & Engineering Notes

When routing these contacts to low-voltage PLC digital input modules (such as 24 VDC systems), be mindful of minimum switching current requirements. Standard power auxiliary contacts can develop microscopic surface oxidation in high-humidity or corrosive atmospheres, which may lead to intermittent signal loss if circuit currents are below 10 mA.

Commissioning & Wiring Tips

Always perform a manual mechanical actuation test post-installation to confirm that the auxiliary contact block moves in complete synchronization with the contactor's solenoid assembly. Ensure wiring harness tension does not pull the auxiliary block away from its snapped seating position, as this can lead to incomplete contact closure.

Installation Guidelines

CRITICAL WARNING:

De-energize the entire control panel and isolate all main and control power circuits prior to installing or removing the auxiliary contact block. Confirm the absence of hazardous control voltages using a calibrated voltmeter. Failure to isolate power can result in severe electrical shock or unexpected machinery startup.

Isolate the control circuit supply and verify that the contactor is physically in the de-energized (open) position.

Align the guide pins on the rear of the CA7-22U block with the corresponding front slot interface of the parent contactor.

Apply firm, even pressure straight down until the locking tab snaps and securely clicks into position.

Terminate control wiring to the screw terminals, ensuring wires are stripped to the proper length and torqued to specifications without over-tightening.

Key Features:

#ABB CA Series #Auxiliary Contact Blocks

What is the contact arrangement of the CA7-22U?

This auxiliary contact block is configured with 2 Normally Open (NO) and 2 Normally Closed (NC) auxiliary contacts to provide status feedback.

How does the CA7-22U auxiliary block mount to the contactor?

It features a front-mounting design that snaps directly onto the face of compatible contactors without requiring any screws or tools.

Can this unit be used for low-current PLC input switching?

Yes, but in environments with high humidity or chemical pollutants, check that the contact resistance does not disrupt low-current PLC inputs, as standard contact interfaces are prone to oxidation under light electrical loads.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin

ABB CA7-22U Auxiliary Contact Block