Porcelain lampholders. E-27
- E-27 · Screw connection · 4 A · 250 V~ · 100 W.
- 678A / 678B · M10/100.
- 678D / 678F · Metal bracket.
Solera porcelain E-27 lampholders: threaded fixing or metal bracket
678A, 678B, 678D and 678F are porcelain E-27 lampholders with screw connections, rated 4 A and 250 V~. Their data sheets specify a maximum power of 100 W. Mounting is the main selection difference: 678A/678B specify M10/100 and anti-rotation protection; 678D/678F use a metal bracket.
Reference comparison
| Reference | Format / mounting | Declared data |
|---|---|---|
| 678A | M10/100 | E-27 · 4 A · 250 V~ · 100 W |
| 678B | M10/100 | E-27 · 4 A · 250 V~ · 100 W |
| 678D | Metal bracket | E-27 · 4 A · 250 V~ · 100 W |
| 678F | Metal bracket | E-27 · 4 A · 250 V~ · 100 W |
Selecting the component
Matching lamp caps and electrical ratings do not establish mechanical interchangeability. Compare drawings, dimensions, orientation and available space. Porcelain is the body material, not authorisation for oven use or any operating temperature; observe the conditions specified for the reference and complete luminaire.
Selection must respect the voltage, current, power and thermal conditions of both the component and the luminaire. Disconnect the supply before installation or replacement and follow the manufacturer’s instructions; a matching lamp cap alone does not validate the complete assembly.
Frequently asked questions
Can one model replace another with the same cap type?
Check fixing, dimensions, connections and electrical and thermal limits. A matching cap does not establish interchangeable mounting.
Does porcelain allow use at any temperature?
No. Permitted temperature must be documented for the component and luminaire; it cannot be inferred from the body material alone.
Can an LED lamp be used?
Only with a matching cap and compatible voltage, supply, dimensions and thermal conditions, within the declared limits.