| Part Number: | ULO | - | TB355 | - | MBKKB 2.5 BU |
|---|---|---|---|---|---|
| Explanation: |
Brand |
Product Code |
Terminal and Color MBKKB 2.5 BU - Blue double-level screw terminal; 2.5mm² nominal cross-section, four connections and two potentials; retain the two spaces shown in the drawing color row |
MBKKB2.5 provides four screw connections across two electrically separate levels. The compact terminal mounts on NS35/7.5 rail and accepts an end cover, compensation end cover and partition plate for terminal-strip assembly.
| Model | Color | Levels | Connections | Potentials |
|---|---|---|---|---|
| ULO-TB355-MBKKB2.5 | Gray | 2 | 4 | 2 |
| ULO-TB355-MBKKB 2.5 BU | Blue |
| Parameter | Value |
|---|---|
| IEC nominal and maximum load current | 24A |
| IEC nominal voltage | 500V |
| Overvoltage category / pollution degree | III / 3 |
| Rated impulse voltage | 6kV |
| Nominal conductor cross section | 2.5mm² |
| Solid conductor | 0.2–4mm²; 24–12AWG |
| Flexible conductor | 0.2–2.5mm²; 24–14AWG |
| Flexible conductor with ferrule | 0.25–1.5mm² |
| Screw size / tightening torque | M3 / 0.5N·m |
| Stripping length | 7mm |
| UL use group | Rated current | Rated voltage | Conductor range |
|---|---|---|---|
| B | 20A | 300V | 30–12AWG |
| C |
The UL conductor range applies to the UL use-group ratings. Select wire and loading to the applicable rating system.
| Parameter | Value |
|---|---|
| Width × length × overall height | 5.15mm × 62mm × 46.8mm |
| Rail-seat-to-top height | 40.5mm |
| Widest local feature | 7.75mm |
| Intermediate level above rail seat | 22mm |
| Rail | NS35/7.5 |
| Protection level | IP20 |
| Operating temperature | -50°C to +110°C |
| Insulation | PA66; material group I; UL94V-0 |
| Contact material / finish | Copper alloy / tin plated |
| Accessory | Reference |
|---|---|
| End cover | ULO-TB392-D-MBKKB2.5 |
| Compensation end cover | ULO-TB392-DP-MBKKB2.5 |
| Partition plate | ULO-TB395-TS-KK3 |
| Fixed bridge | ULO-TB390-FBI XX-5 |
| Pluggable bridge | ULO-TB390-EB XX-5 |
| Marker strip | ULO-TB391-ZB5; ULO-TB391-ZBF5 |
| Marker card | ULO-TB394-B1; ULO-TB394-B2; ULO-TB394-B3 |
| End clamp | ULO-TB393-E/UK; ULO-TB393-E/UK1; ULO-TB393-E-WA |
| Dimension range | Total pitch tolerance | Nominal dimension tolerance |
|---|---|---|
| 0–30mm | ±0.18mm | ±0.20mm |
| Over 30–53mm | ±0.20mm | ±0.25mm |
| Over 53–70mm | ±0.25mm | ±0.30mm |
| Over 70–90mm | ±0.30mm | ±0.35mm |
| Over 90–115mm | ±0.35mm | ±0.44mm |
| Over 115–150mm | ±0.44mm | ±0.55mm |
| Over 150–200mm | ±0.55mm | ±0.70mm |
| Over 200–250mm | ±0.70mm | ±0.80mm |
| Over 250–320mm | ±0.75mm | ±0.90mm |
Geometric tolerances: perpendicularity 0.2mm through 10mm and 0.3mm above 10mm; symmetry 0.3mm; straightness 0.2mm through 100mm; parallelism 0.3mm over 100–150mm and 0.5mm above 150mm.
