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© 2012 Littelfuse • Transportation Products Catalog Excerpt

Power Distribution Centers

Description

flexibility to design electrical distribution systems. It’s a totally

modular way to build your own junction box. POWR-BLOKS are

perfect for applications where space or vehicle function demand a

tailor made approach. The Littelfuse POWR-BLOKS can be

modified, re-sized, reconfigured or added to at any time.

Mechanical Strength for Any Application

POWR-BLOKS modules are molded from glass reinforced nylon

for dimensional stability, excellent rigidity, high and low

temperature resistance and tensile strength:

Specifications

Test

Voltage Rating

48VDC

Temperature range

-40°C to +125°C

Durability

Minimum 50 cycles of engagement/

disengagement

Drop

1.22 meters onto wooden platform

Thermal Shock

5 Cycles from -40°C to +125°C

Mechanical Shock

50g in each of 3 mutually perpendicular axis

Fluid Compatibility

Gasoline, diesel fuel, motor oil, antifreeze,

brake fluid, ATF

*Max. Current Indication

The information listed as Max. current indication is to be used as a

guideline only. The maximum allowable rating of the fuses used

depends on design criteria such as maximum current, nominal

current the duration for which the circuits are energized, as well as

external factors as ambient temperature. All modules should

therefore be tested as an assembly, and users should make their

own evaluation to determine the suitability of the product for their

specific applications.

How to use the Littelfuse

POWR-BLOKS system

1. Identify the electrical system parameters

- Space availability and requirements

- Circuit protection components

- Relay and flasher components

- Components for special needs

2. Select the Littelfuse POWR-BLOKS components. Lay out the

electrical panel as designed. Then determine the appropriate

type and quantity of POWR-BLOKS modules, BLOCK LOKS and

TERMINAL LOKS you need.

3. Build the panel by row. POWR-BLOKS can be assembled

without special tools. Assemble the block from the rear by

placing all modules face down on a flat surface. POWR-BLOKS

should be designed by row, either going across or up and down.

4. Use BLOK LOKS to interconnect modules. BLOK LOKS are used

to connect and stack POWR-BLOKS modules. Press together a

row of modules and insert green BLOK LOKS until they snap into

place. Repeat this procedure to interlock all assembled rows.

5. Add mounting modules. Once a POWR-BLOKS panel is

assembled, add mounting modules that are most suitable for

your application. Mounting options include surface mounting

legs, a side mounting bracket and a mounting module with three

different sized spacers.

6. Plug in terminated wiring. Wire your POWR-BLOKS panel and

plug in the terminated wires, then insert the optional matching

TERMINAL LOKS devices. Littelfuse TERMINAL LOKS are

designed to fit special POWR-BLOKS modules and inserted in

the same manner as BLOK LOKS.

The information and illustrations given in this catalogue are

believed to be reliable and accurate. Littelfuse makes no

warranties as to their accuracy or completeness, and disclaims any

liability in connection with their use. Littelfuse’s only obligations

are those in the standard terms of sale for this product and

Littelfuse will not be liable for any consequential or other damages

arising out of the use or misuse of this product. Littelfuse reserves

the right to make changes to the contents hereof without notice.

It is suggested that at the time of inquiry Littelfuse Sales

personnel be contacted directly for verification of published

specifications and product availability.