Product Overview

The ABB CA5-01 is a single-pole auxiliary contact block with one
normally closed contact. It is part of ABB’s accessory range for
contactors and is used when an additional electrical contact is
required without changing the main power-contact configuration of
the contactor.

Auxiliary contacts are commonly used to transmit the operating
state of a contactor to another part of an electrical control
circuit. They can also be used to create holding circuits,
electrical interlocks, alarm functions, sequence logic, and
feedback signals. The CA5-01 provides a normally closed contact,
meaning the auxiliary circuit is closed when the associated
contactor is in its normal de-energized state and changes state
when the contactor operates.

Model Identification

The complete ABB ordering code is
1SBN010010R1001. The corresponding product type is
CA5-01. ABB documentation identifies this
ordering code specifically as a CA5-01 auxiliary contact block.

The CA5-01 should be distinguished from the closely related CA5-10
configuration. CA5-01 provides one normally closed contact,
whereas CA5-10 provides one normally open contact. Because these
two components can have a similar physical appearance, the complete
ordering code should be checked when selecting an accessory for an
existing contactor.

Contact Configuration

The CA5-01 contains one normally closed auxiliary contact. In
control terminology, a normally closed contact is closed in the
normal position and opens when the associated switching mechanism
changes state.

This configuration is useful in control circuits that require a
signal while the contactor is not energized or that need a
normally closed path to be interrupted when the contactor operates.
Typical applications include electrical interlocking, status
indication, control logic, alarm circuits, and feedback to
automation equipment.

The auxiliary contact does not replace the main power contacts.
Instead, it provides an independent low-power control path that
can be incorporated into the electrical logic associated with the
contactor.

Technical Specifications

Front-Mounting Design

ABB 1SBN010010R1001 is designed for front mounting on compatible
ABB contactors. The front-mounted configuration allows the
auxiliary contact to be installed directly on the contactor
assembly without requiring a separate mounting position on the
control panel.

This arrangement is useful in compact motor control panels where
available cabinet space is limited. The auxiliary contact remains
mechanically associated with the contactor, allowing its switching
state to follow the operating condition of the main contactor.

Before installation, compatibility between the CA5-01 and the
specific contactor should be verified. ABB contactor families can
use different accessory systems, and an auxiliary block intended
for one family should not automatically be assumed to fit another
family.

Electrical Function

The CA5-01 is designed for use in auxiliary control circuits rather
than as a primary power switching device. Its normally closed
contact can be incorporated into control sequences where the
circuit must remain closed until the associated contactor changes
state.

For example, the auxiliary contact can be connected to a PLC input
to provide a feedback condition. It can also be used in a relay
logic circuit to prevent another contactor from being energized
while a particular contactor is operating. In motor starter
systems, normally closed auxiliary contacts can therefore be
useful for electrical interlocking and sequence control.

Applications

ABB 1SBN010010R1001 can be applied in industrial motor control
panels, machine automation systems, electrical distribution
assemblies, conveyor systems, pump control panels, HVAC control
equipment, and other installations using compatible ABB
contactors.

Typical functions include contactor status feedback, electrical
interlocking, alarm circuits, control sequencing, and auxiliary
signaling. When connected to a programmable controller, the
auxiliary contact can provide a simple electrical indication of
contactor operating status.

The actual application should be designed according to the
electrical characteristics of the auxiliary circuit. In
particular, the rated operational voltage and current should not
be exceeded.

Installation Considerations

Installation should be carried out by qualified personnel with the
associated electrical equipment isolated from hazardous voltage.
Before installation, confirm the contactor type, accessory
compatibility, contact configuration, and terminal identification.

The CA5-01 uses screw terminals for electrical connections. The
conductors should be selected according to the applicable
installation requirements, and terminal connections should be
properly secured. The auxiliary circuit should be protected and
operated within the rated electrical conditions.

Because the CA5-01 is a normally closed auxiliary contact, the
expected contact state should be verified during commissioning.
This is particularly important when the contact is used for
safety-related interlocking, sequence control, or feedback logic.

CA5-01 Compared with CA5-10

The ABB CA5-01 and CA5-10 are closely related auxiliary contact
blocks, but their contact configurations are different. The
CA5-01 uses one normally closed contact, while the CA5-10 uses one
normally open contact.

This distinction is important when replacing an auxiliary contact
block. A CA5-10 cannot automatically be considered an equivalent
replacement for a CA5-01 because the control logic will respond
differently to the contactor’s operating state.

The ordering code should therefore be checked against the original
component and the electrical schematic before replacement. For
ABB 1SBN010010R1001, the correct type reference is CA5-01.

Maintenance and Inspection

The auxiliary contact block should be inspected together with the
associated contactor during scheduled maintenance. Inspection can
include the mechanical attachment, terminal connections, contact
circuit behavior, and overall condition of the control assembly.

If the control system receives an unexpected status signal, the
CA5-01 contact circuit and the mechanical operation of the
associated contactor should be checked. Loose connections,
incorrect wiring, or an incompatible auxiliary contact
configuration can affect the expected control sequence.

Maintenance procedures should always follow the applicable
electrical safety requirements. The circuit should be isolated
before physical inspection or work on the auxiliary contact
assembly.

Replacement and Selection

When selecting ABB 1SBN010010R1001 as a replacement component, the
complete ordering code should be compared with the existing
auxiliary contact block. The most important identification points
are the CA5-01 type reference, one normally closed contact,
front-mounting configuration, and screw terminal connection.

Physical dimensions alone should not be used to determine
compatibility. The electrical contact configuration and the
contactor accessory system must also correspond to the existing
installation. This is especially important when replacing older
control equipment or modifying an existing motor control panel.

Conclusion

ABB 1SBN010010R1001 is the CA5-01 auxiliary contact block designed
for compatible ABB contactors. It provides one normally closed
auxiliary contact, front mounting, and screw terminal connections.
Its compact dimensions of approximately 47 × 11 × 32.5 mm allow
it to be integrated directly into suitable contactor assemblies.

The CA5-01 is suitable for control, signaling, interlocking, and
contactor feedback applications. When selecting or replacing the
component, the complete ABB ordering code should be checked to
distinguish it from the CA5-10 normally open configuration and
other auxiliary contact accessories.