Phoenix Contact Fuse Terminal Block - PTTB 4 - 3211888
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Product Information
Full details
This Phoenix Contact 3211888 fuse terminal block is designed for professionals needing reliable fuse protection for 5x20mm glass or ceramic fuses in electrical circuits up to 28A and 500V. Its key benefit is the tool-free Push-in connection technology, significantly speeding up wiring. A potential caveat is its specific fuse size compatibility, requiring users to ensure their fuses are 5x20mm.
All features
| Model Part Number | 3211888 |
|---|---|
| Brand | Phoenix Contact |
Extended Product Information
FAQs
What type and size of fuses does this terminal block accept?
This terminal block is designed to accept standard 5x20mm glass or ceramic fuses.
What is the maximum current and voltage rating?
The terminal block has a nominal current rating of 28A and a nominal voltage rating of 500V.
Can I use stranded wire without ferrules?
The Push-in connection is optimized for solid conductors or stranded conductors with ferrules. While some stranded wires might insert, it is not recommended for reliable and secure connections.
How do I test the circuit through this terminal block?
The terminal block features a double function shaft and an additional test connection specifically for circuit testing.
What is the purpose of the LED status indicator?
The LED status indicator provides a visual signal to quickly identify when a fuse has blown, simplifying troubleshooting.
What are the dimensions of this terminal block?
The terminal block has a width of 6.2mm, a height of 75.5mm, and a length of 102.9mm.
What mounting rails is this compatible with?
It is compatible with standard NS 35/7.5 and NS 35/15 mounting rails.
Troubleshooting
Terminal block not securely attached to the rail
Remove the terminal block and re-slide it onto the mounting rail, ensuring it clicks firmly into position.
Conductor will not insert into Push-in terminal
Verify the conductor is solid or has a properly crimped ferrule. Ensure the wire gauge is within the 0.2-6 mm² range. Check for any obstructions in the terminal opening.
Fuse repeatedly blows
Check the connected circuit for overloads or short circuits. Ensure the correct fuse rating (28A maximum) is used. The LED indicator should identify the blown fuse.
LED status indicator is not lit
Ensure the fuse is correctly inserted and functional. Check that the terminal block is properly wired and receiving the nominal voltage (24V specified for LED functionality, though block operates at 500V). Confirm the LED is not damaged.
Pros and Cons
Pros
- Tool-free wiring significantly reduces installation time.
- Compact 6.2mm width maximizes space in control panels.
- Integrated LED status indicator simplifies fault finding.
- Robust construction meets UL 94 V-0 fire protection standards.
- Compatible with standard mounting rails for easy integration.
Cons
- Only accepts 5x20mm fuses; not compatible with other sizes.
- Requires specific ferrules or solid conductors for optimal Push-in connection.
- Maximum voltage rating of 500V may not be sufficient for all high-voltage applications.
Setup, Compatibility & Care
Setup:
- Ensure the mounting rail (NS 35/7.5 or NS 35/15) is securely installed.
- Slide the terminal block onto the mounting rail until it clicks into place.
- Prepare the conductor: strip the end to the appropriate length (refer to technical specifications) or use a ferrule.
- Insert the conductor directly into the Push-in connection opening until it is firmly seated. To release, use a standard screwdriver or probe in the designated release slot.
- Insert a 5x20mm glass or ceramic fuse into the fuse holder.
Compatibility:
- Fuses: Designed exclusively for 5x20mm glass or ceramic fuses.
- Conductors: Compatible with solid conductors and stranded conductors with ferrules, ranging from 0.2 mm² to 6 mm² (AWG 24 - 10).
- Mounting Rails: Fits standard NS 35/7.5 and NS 35/15 mounting rails.
Care:
- Clean the exterior of the terminal block with a dry or slightly damp, lint-free cloth. Avoid using solvents or abrasive cleaners.
- Ensure fuse contacts remain clean to ensure good electrical connection.
- Periodically inspect for any physical damage.