How Does the ABB SB822 3BSE018172R1 Protect AC 800M Controller Memory During Power Interruptions?-amikonpower.com

How Does the ABB SB822 3BSE018172R1 Protect AC 800M Controller Memory During Power Interruptions?

August 14,2026

A brief interruption in the main power supply can create serious concerns in a process-control environment. Even when the interruption does not damage the controller hardware, maintaining controller memory during an extended shutdown may be important for orderly restoration and system availability.

The ABB SB822 3BSE018172R1 Rechargeable Battery Unit provides external battery backup for ABB AC 800M controllers. It is a DIN-rail-mounted accessory with an integrated rechargeable lithium-ion battery, a 24 V DC connector, and a TK821V020 connection cable. Its role is specifically related to controller memory backup rather than supplying operating power to the entire controller, I/O system, or control cabinet.

What Is the ABB SB822 3BSE018172R1 Rechargeable Battery Unit?
The SB822 is an external rechargeable battery unit developed for the ABB AC 800M controller family. Its complete article number is 3BSE018172R1, and ABB classifies it as a rechargeable battery unit with a rated output voltage of 3.6 V.

Unlike a standard replaceable internal battery, the SB822 includes charging circuitry connected to a 24 V DC supply. When the controller is normally powered, the external unit can maintain its charge. If the main controller power is interrupted, the battery provides the backup required for controller memory retention for a period determined by the connected processor type.

Key Technical Specifications for ABB SB822 3BSE018172R1
Manufacturer : ABB
Product No. : 3BSE018172R1
Product type : SB822 Rechargeable Battery Unit
Number of batteries : 1
Input current maximum (Iin) : 0,1 A
Number of outputs : 1
Output voltage (Uout) : 3,6 V
Output current maximum (I) : 0,05 A
Shipping weight : 3Kg

Why Does Rechargeable Memory Backup Matter, and Who Benefits from It?
The purpose of the SB822 is to extend controller memory backup during a loss of normal power. ABB’s controller documentation distinguishes the rechargeable SB822 from the SB821 and the internal lithium batteries, which are non-rechargeable. ABB notes that non-rechargeable batteries may need replacement following commissioning, repeated shutdowns, or extended power failures to preserve their specified backup capacity. ABB Library
A rechargeable external unit can therefore be useful where shutdowns occur periodically or where the controller may remain without its normal power source for longer than the internal battery is intended to support.
The people most directly concerned with this function include:
Control-system engineers selecting AC 800M accessories
System integrators designing controller cabinets
Commissioning engineers preparing a new installation
Maintenance teams managing battery condition
Reliability personnel planning extended plant shutdowns
Procurement teams replacing an existing SB822 unit

Where Is the SB822 Installed, and How Does It Connect to an AC 800M Controller?
The SB822 is mounted externally on a DIN rail. ABB’s documentation states that it is connected to the processor unit through a cable, while its charger is supplied from 24 V DC. The current ABB catalog identifies the supplied connection cable as TK821V020 and confirms that the package includes the lithium-ion battery and 24 V DC connector.

Its DIN-rail format enables it to be positioned beside the AC 800M controller hardware inside an appropriately arranged control cabinet. With a width of approximately 85.8 mm and a height of 136 mm including the hatch, sufficient rail space and access should be reserved for installation, wiring, inspection, and replacement.

The IP20 protection rating means that the unit is intended for an installation environment where suitable protection against accidental contact and environmental exposure is provided. Cabinet layout should also account for the official 0 to +55°C ambient specification, Degree 2 pollution conditions, and G2 corrosive-atmosphere classification.

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