# PoE Midspan Injector HP Instant On 802.3af 15.4W – R8W31A, 15.4W output

**URL:** https://aio.lv/en/product--hp-r8w31a--12102934
**Data updated:** 2026-03-20 09:53 (EET)
**Category:** PoE Adapters
**Manufacturer:** HP
**Manufacturer code:** R8W31A
**EAN:** 190017561264
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 55.49 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 45.86 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--hp-r8w31a--12102934

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

HP Instant On 802.3af PoE midspan injector (R8W31A) supplies 15.4W of power over Ethernet to a single powered device. Compact inline unit (weight 199.6 g) adds PoE capability to non‑PoE switches for access points, IP phones and cameras. Compatible with 802.3af standard, suitable for small office and network edge deployments.

## Long description

HP Instant On 802.3af PoE midspan injector supplies up to 15.4W of power over a single Ethernet connection to enable Power over Ethernet for non‑PoE switches and legacy network equipment. This compact inline unit is designed to be inserted between an existing switch and a powered device, providing compliant 802.3af power to access points, IP phones and cameras without replacing the network switch. The injector's small size and low weight make it convenient for desk, rack or wall installation in small office and edge network environments.
Advantages
The midspan injector is compatible with the IEEE 802.3af standard and delivers a reliable 15.4W output to a single powered device, enabling simple retrofit of PoE to existing copper Ethernet links. Its inline form factor reduces the need for additional wiring or power outlets at the powered device location and minimizes deployment complexity. The unit is compact and lightweight, which simplifies placement and handling during installation and maintenance.
Suitable for
 Adding PoE capability to non‑PoE switches for wireless access points
 Powering IP desk phones and VoIP devices
 Supplying power to low‑to‑moderate power security or monitoring cameras
 Small office and network edge deployments where switch replacement is not desired
Key specifications
 Power standard: IEEE 802.3af (PoE)
 Maximum power per port: 15.4 watts
 Ports: single‑port inline injector (data passthrough plus powered output)
 Form factor: compact inline unit suitable for desk, wall or rack mounting
 Weight: approximately 199.6 g
How to use
Connect the injector's data input to your existing Ethernet switch using a standard CAT5e or higher cable, then connect the injector's output to the powered device with a second Ethernet cable. Ensure the switch port provides data (no power), and verify the connected device supports IEEE 802.3af power. After connections are made, apply power to the injector from a nearby AC outlet; the device will negotiate power delivery to the connected PD (powered device) automatically. Follow local safety regulations when routing cables and installing the unit.
Usage recommendations
Use quality Ethernet cables (CAT5e or better) and keep total cable length within standard Ethernet limits to maintain reliable data and power delivery. Verify the powered device's maximum power draw is within the 15.4W budget and allow for some headroom for stable operation. For deployments with multiple PoE devices, consider a PoE switch or a multi‑port midspan solution to centralize power management.

## Specifications

### Power

| Feature | Value |
|---|---|
| Input voltage | 100 - 240 |
| Input current | 0.43 |
| Output current | 0.35 A |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.1996 kg |
| Height | 16 mm |
| Width | 36 mm |
| Depth | 51 mm |

### Certificates

| Feature | Value |
|---|---|
| Certification | CE, FC, VCI, cUL US, UL GS, EAC |
| Compliance certificates | RoHS |

### Network

| Feature | Value |
|---|---|
| Networking standards | IEEE 802.3af |

## FAQ

### How much does the PoE Midspan Injector HP Instant On 802.3af R8W31A cost, and is it available for purchase?

The price is 55.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 06.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All HP products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized HP service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/12102934/67636338_large.webp