> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/cc-hardware/cabinets-and-power/class-5-power-supply-how-to-guides.md).

# Class 5 Power Supply

A Class 5 system represents the **highest level of security classification** for electronic intruder alarm systems under the Australian and New Zealand standard **AS/NZS 2201**.

The Class 5 power supplies are supplied with the **Class 5 cabinets**. They have a supply limit of **7.5 amps**. They differ from standard Gallagher supplies by having more sensing ability, including a **battery thermal sensor**.

## Specifications

| Model #       | Output Voltage (V) | Rated Current (A) | Charge Limit (A) | Recommended Load (A) | Peak load on power fail (A) |
| ------------- | ------------------ | ----------------- | ---------------- | -------------------- | --------------------------- |
| **SR100Hi12** | 13.8               | 7.5               | 7.5              | 6                    | 11                          |

## When the Class 5 PSU is used

* Class 5 high-security cabinets, where the additional sensing ability (including the **battery thermal sensor**) is part of the higher security and monitoring profile.
* Where peak load on power fail can exceed the 8 A power supply's rated output. The Class 5 peak load is 11 A.

## Differences from standard Gallagher power supplies

| Feature                 | Standard 8 A PSU (C200440)         | Class 5 PSU (SR100Hi12)                         |
| ----------------------- | ---------------------------------- | ----------------------------------------------- |
| Rated current           | 8 A                                | 7.5 A                                           |
| Recommended load        | Under 7 A continuous               | 6 A continuous                                  |
| Peak load on power fail | Not rated                          | 11 A                                            |
| Battery thermal sensor  | No                                 | **Yes**                                         |
| Other sensing           | Mains fail and Low Battery         | Mains fail, Low Battery and **battery thermal** |
| Designed for            | General Gallagher cabinet installs | Class 5 high-security installs                  |

![Class 5 power supply](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-8cfaf4df4369972c25229a8c66ace220a50b37a8%2FSECHUB-PSU-CLASS5-01-class5-power-supply.png?alt=media)

***

🔗 **Related**

* [Gallagher Power Supplies ](/knowledge-hub/products/cc-hardware/cabinets-and-power/gallagher-power-supplies-how-to-guides.md). The standard 3.5 Ah and 8 A supplies this one is compared against.
* [Cabinets and Power](/knowledge-hub/products/cc-hardware/cabinets-and-power.md). The cabinet range these supplies are fitted into.
* [Secondary Power Supplies](/knowledge-hub/products/cc-hardware/cabinets-and-power/seperate-power-supplies.md). Powering Gallagher devices from a second or third-party supply.


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