Power / Electrical Connectors
Installation Guide for R. STAHL 8573/12-303 Extra-Low Voltage Plug
Comprehensive installation guide and technical specifications for the R. STAHL 8573/12-303 16A extra-low voltage plug. Includes explosion protection ratings, electrical data, and mounting requirements.
Quick answers from the manual
Quick answer
- The R. STAHL 8573/12-303 is a 16A extra-low voltage plug for hazardous areas (Zones 1, 2, 21, 22). It uses screw terminals, supports cables 8-15mm in diameter, and is compatible with Series 8575 sockets. p. 1, 2
Key actions
- Install the cable using the screw terminals. p. 2
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Rated operational voltage | 20 to 25 & 40 to 50 V AC | Operating voltage range | p. 1 |
| Rated operational current | min. 12 A / max. 3 A | Current capacity | p. 1 |
| IP degree of protection | IP66 / IP64 | Ingress protection rating | p. 2 |
Where to find it in the PDF
- Product Overview and Electrical Data p. 1
- Mechanical Data and Installation p. 2
- Dimensional Drawings p. 3
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The R. STAHL 8573/12-303 is a 16A extra-low voltage plug designed for use in hazardous areas. It is compatible with Series 8575 sockets and features a robust, corrosion-resistant design. Ensure the cable diameter is between 8 and 15 mm before installation. The device is certified for use in Zones 1, 2, 21, and 22.
Product Overview
The Series 8573/12 plugs are designed for 2- or 3-pole applications up to 16 A. They feature floating pins for easy insertion and removal, and an inner, pivoting strain relief for quick cable installation. The contact pins are made from corrosion-free materials to ensure optimal electrical contact.
Technical Data
Electrical Data:
- Rated operational voltage: 20 to 25 V AC and 40 to 50 V AC
- Rated operational current: min. 12 A / max. 3 A
- Frequency range: 400 Hz
- Mechanical service life: > 5x10³ mating cycles
Explosion Protection:
- Scope of validity: European Union (ATEX), IECEx, China (CQST)
- Application range (zones): 1, 2, 21, 22
- Gas explosion protection: Ex eb IIC T6 Gb
- Dust explosion protection: Ex tb IIIC T70 °C Db
Mechanical Data and Installation
Mechanical Specifications:
- IP degree of protection: IP66 (IEC 60529) / IP64 (IEC 60079)
- Enclosure material: Polyamide, Glass fibre reinforced
- Impact strength: IK10 (IEC 62262) / 7 J (IEC 60079)
- Weight: 0.3 kg (0.66 lb)
Installation Requirements:
- Connection type: Screw terminal
- Cable diameter: 8 – 15 mm (0.31 – 0.59 in)
- Ambient temperature: -50 °C to +40 °C (3 A) or -50 °C to +60 °C (12 A)
Practical help
Common problems
Cable diameter outside specified range
Ensure the cable diameter is between 8 mm and 15 mm. Using cables outside this range may compromise the IP protection rating.
Incorrect voltage application
Verify that the supply voltage is within the rated 20-25V or 40-50V AC range before connection.
Before use
- Verify the cable diameter is between 8-15 mm.
- Ensure the supply voltage matches the rated 20-25V or 40-50V AC.
- Confirm the installation environment is within the approved zones (1, 2, 21, 22).
- Check that the screw terminal connections are secure.
- Ensure the plug is compatible with the socket (Series 8575).
Specs in practice
- Clock hour position
- A coding system (3h) used to identify the specific voltage/frequency configuration of the plug.
Images and diagrams
- The clock hour position diagram illustrates the pin configuration for 3-pole applications.
- Dimensional drawings provide the physical footprint (78mm width/height, 166mm length) for installation planning.
Model compatibility
- 100% compatible with Series 8575 sockets.
- Replaces the older Series 8575 plugs.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.