Why Choose the ABB 1SBH131001R8139 NFC33/11-81 Contactor Relay?
The ABB 1SBH131001R8139, also known as the NFC33/11-81, is an 8-pole AC-operated contactor relay designed for reliable switching of auxiliary and control circuits in industrial automation and electrical control systems. As part of the ABB NFC contactor relay range, it uses electromagnetic control with optimised operating times for AC-controlled applications.
The NFC33/11-81 provides 8 auxiliary contacts, comprising 4 normally open (N.O.) and 4 normally closed (N.C.) contacts. Its specialised arrangement incorporates 1 leading N.O. contact and 1 lagging N.C. contact, providing overlapping contact operation for control sequences where precise switching behaviour is required. The auxiliary contacts are mechanically linked in accordance with IEC 60947-5-1 requirements.
With a 24 V AC 50/60 Hz electromagnetic control coil, screw terminals and a compact block-type design, the NFC33/11-81 is straightforward to integrate into industrial control panels. Its 690 V IEC rated operational voltage and compatibility with ABB AF-platform accessories make it a flexible solution for machinery, signalling, sequencing and electrical interlocking applications.
Key Advantages
- Reliable 8-pole contactor relay for auxiliary and control circuits.
- 4 N.O. + 4 N.C. auxiliary contact configuration for versatile control functions.
- Includes 1 leading N.O. and 1 lagging N.C. contact for overlapping switching.
- 24 V AC 50/60 Hz control coil for low-voltage AC control systems.
- 690 V IEC rated operational voltage for industrial applications.
- Mechanically linked contacts support dependable control and interlocking functions.
- Screw terminals provide secure and convenient field wiring.
- Expandable with compatible ABB auxiliary contact blocks and AF-platform accessories.
Key Features
- ABB NFC33/11 contactor relay series.
- NFC33/11-81 model for AC-controlled applications.
- 8 auxiliary contacts: 4 N.O. + 4 N.C..
- 1 leading normally open contact.
- 1 lagging normally closed contact.
- 24 V AC 50/60 Hz rated control voltage.
- 690 V IEC rated operational voltage.
- 3 A rated operational current at 400 V.
- 4 A rated switching current.
- Mechanically linked auxiliary contacts.
- Compact 45 mm-wide block-type construction.
- DIN rail or screw mounting for flexible panel installation.
Reliable Auxiliary Switching for Industrial Control Systems
Contactor relays such as the ABB NFC33/11-81 allow one electromagnetic control signal to operate multiple auxiliary circuits simultaneously. The combination of normally open and normally closed contacts supports electrical interlocking, machine sequencing, signalling and automation functions within industrial control systems.
The NFC33/11 configuration additionally incorporates leading and lagging contacts to provide overlapping switching behaviour. Combined with mechanically linked auxiliary contacts, compact block construction and compatibility with the wider ABB AF accessory platform, this makes the NFC33/11-81 particularly useful for sophisticated industrial control circuits requiring dependable contact sequencing.
Typical Applications
- Industrial automation and electrical control panels.
- Machine control and sequencing circuits.
- Motor starter auxiliary control circuits.
- Electrical interlocking systems.
- PLC and automation interface circuits.
- Signalling and indication circuits.
- Manufacturing and production machinery.
- OEM electrical control systems and machine building.
