Following points are covered - (German!)
Nominal Current/Switch-Off current, important difference between IEC and UL/CSA! Breaking capacity, voltage rating, melting I²t, types of fuses, approvals. 

Download Application-note Fuseology(pdf)-German!

Lifetime of aluminium electrolytic capacitors depends very much on operating- and system temperature and on ripple current stress.
How to find life expectancy based on datasheet values and actual operating conditions?
The basic interrelations and formulas you will find in the Application Note NCC_Precautions_and_Guidelines starting on page 7.

A compressed summary of all formulas for different temperatures you can find in Load Life Expectancy.pdf

Ready-to-use lifetime calculation Excelsheets for Aluminium Electrolytic Capacitors in the temperature range of 85°C, 105°C and 125°C are available by request HERE.

Snap switches are activated by a spring-operated (or “snap-action“) mechanism. Depressing the actuator triggers the switching operation, with a predefined force and travel. The switching speed itself is largely independent of the speed of actuation.

The Switch Lexicon explains all important electrical and mechanical parameters for selsecting the right switch.

Download Cherry Switch-Lexicon.pdf