UL Type 3R or Type 12 rated quarter turn latche
UL Type 3R or Type 12 rated quarter turn latche
(OP)
Anyone know of an off the shelf quarter turn latch that is rated/passed UL Type 3R or Type 12 rating?
Jason Schultz
Mechanical Engineer
Yaskawa Electric America
"It's got to be 5pm somewhere!"





RE: UL Type 3R or Type 12 rated quarter turn latche
UL type 3R and 12 are protection ratings for enclosures. The usual design strategy is the locate the latches outside the protected volume, in which case, the latch rating is irrelevant.
You can buy screws with built-in O-rings.
Quarter turn fasteners have clamping forces of 30 to 150lb, depending on their size. Do you think this is enough to clamp an O-ring reliably.
RE: UL Type 3R or Type 12 rated quarter turn latche
Jason
Jason Schultz
Mechanical Engineer
Yaskawa Electric America
"It's got to be 5pm somewhere!"
RE: UL Type 3R or Type 12 rated quarter turn latche
Doing that led me to a Hoffman catalog which offered "Latch Kits for Type 4 and 12 Enclosures."
I didn't bother checking any of the other hits that came up.
Patricia Lougheed
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RE: UL Type 3R or Type 12 rated quarter turn latche
Jason Schultz
Mechanical Engineer
Yaskawa Electric America
"It's got to be 5pm somewhere!"
RE: UL Type 3R or Type 12 rated quarter turn latche
James Spisich
Design Engineer, CSWP
RE: UL Type 3R or Type 12 rated quarter turn latche
Are you sure the latches themselves are NEMA 3R and 12?
As I noted above, if the latches are attached entirely outside the sealed volume, then it does not matter what specification they meet. You worry about the gasket inside your lid. If the fastener meets 3R and 12, it has a gasket which at best, is another point of failure.
RE: UL Type 3R or Type 12 rated quarter turn latche
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