# Switchroom service-socket residual-current interface

Canonical URL: https://eloragrid.ai/symbols/switchroom-service-socket-residual-current-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: SSRI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchrooms
Input: Service-socket circuit condition
Output: Socket circuit protective action

Identifies residual-current protection assigned to the documented room service-socket circuit.

## In plain English

### What this block does

Identifies residual-current protection assigned to the documented room service-socket circuit.

### A simple example

In a switchroom, the lighting, service sockets, charger input and room cooling may be fed from different auxiliary branches. A source change must preserve the identities of loads that require continuity. For this reference, the drawing identifies “Service-socket circuit condition” at the input and “Socket circuit protective action” at the output. Required protection depends on installation rules.

### What the drawings help you do

Start at the named input: Service-socket circuit condition. Identify its source device or document and the state represented on the drawing. Follow the named output: Socket circuit protective action. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Service-socket circuit condition
- Output: Socket circuit protective action
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Service-socket circuit condition → SSRI → Socket circuit protective action
A reading guide. The entry's original illustration and input/output facts describe this application.

- [SEL-RPM redundant power module](https://selinc.com/products/RPM/)


## What it represents

Identifies residual-current protection assigned to the documented room service-socket circuit. An auxiliary AC distribution diagram identifies the supplies serving room services and control-support equipment. Essential, backed-up and ordinary circuits can have different source paths and operating priorities.
In a switchroom, the lighting, service sockets, charger input and room cooling may be fed from different auxiliary branches. A source change must preserve the identities of loads that require continuity. For this reference, the drawing identifies “Service-socket circuit condition” at the input and “Socket circuit protective action” at the output. Required protection depends on installation rules.
Label source, branch protection and load purpose. The arrangement does not establish conductor sizes, protection settings or installation compliance; it links the operating role to the selected equipment schedule. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

## How to read it

- Start at the named input: Service-socket circuit condition. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Socket circuit protective action. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Required protection depends on installation rules.
- Label source, branch protection and load purpose. The arrangement does not establish conductor sizes, protection settings or installation compliance; it links the operating role to the selected equipment schedule.

## Information to show or reference

- Label the source and connection reference for service-socket circuit condition.
- Identify the destination and defined state of socket circuit protective action.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Required protection depends on installation rules.

## Important distinction

Required protection depends on installation rules. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

## Facts

- Representation: Functional block
- Installation focus: Switchrooms
- Input / boundary: Service-socket circuit condition
- Output / connection: Socket circuit protective action
- Lookup label: SSRI is a library lookup label, not a standard device designation.

## Public references

- [SEL-RPM redundant power module](https://selinc.com/products/RPM/) — SEL. Public technical context for switchroom auxiliary ac distribution. Independent AC and DC sources for station auxiliary power. The application text and educational graphic are independently authored; the publisher does not certify this representation.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.