A typical low-voltage variable-frequency drive. Industrial facilities commonly use variable-frequency drives (VFDs) to control the speed at which alternating current motors operate. Let’s examine a ...

Generally, the Art. 210 requirements for branch circuits are prerequisites for applying requirements found elsewhere. This fact is exemplified by the overcurrent protection requirements [Sec. 210.20].

I continue to be surprised by how many equipment designers are confused by UL circuit protection standards. In trying to meet conflicting standards, engineers may actually decrease the level of ...

Said to be ideal for applications requiring branch circuit protection that comply with UL and CSA standards, the Bulletin 1492-MC circuit breakers may be used to protect wiring and associated ...

The usual way of preventing a small motor from drawing too much current is to install overcurrent protection in the form of a circuit breaker or some other kind of limiter. But installations that ...

Gladiator miniature circuit breakers offer optimum and efficient protection for branch and control circuits up to 63 amps. The Gladiator GMCBU series is available with B, C, or D trip characteristics ...

TO BE READ BY ALL ELECTROSCHEMATICS ENTHUSIASTS! Much needs to be said about this oft neglected subject. We would never even think of connecting the utility mains to our house without proper circuit ...

My introduction to circuit protection came at the tender age of eight. Being a curious lad with an inventive – and apparently self-destructive – bent, I decided to make my mother a lamp. I put a hose ...

Middletown, Pa. — Touch-safe fuse terminal blocks from Phoenix Contact accept Class CC and Class J fuses to meet National Electrical Code requirements for branch circuit protection. UL-Listed for ...

Description: The UL 489 B1NQT is a recyclable quick-connect breaker. It’s available in three curves (B, C, and D), ranges 0.5-63 A, and has an optional detachable shield that makes installation easier ...

The new Allen-Bradley Bulletin 140MT motor protection circuit breakers from Rockwell Automation offer enhanced Type F combination motor controller ratings when used with Bulletin 100-C and 100-E ...