- Double throw safety switch - 
- UL standards for double throw safety switches stipulate 4000 cycles rating at 100% power. Should be more at partial power. 
- Must use several SPDT for creating an automated DPDT relay? Ie, with logic, you turn certain contacts on, and certain contacts off.
- GE 100A $200 
- Eaton 100A
- $86 - CSA but non-UL? . You can look up the CSA listing here - it is CSA listed as file # 025483_0_000 
- Notes: 'not meant to be switched every day'