Sprecher + Schuh's KT9 series of Motor Circuit Controllers are some of the most versatile and technologically advanced control products available today. These devices can be used in a variety of control schemes that reduce panel space, simplify installation and eliminate the need for more expensive equipment.

• Current-limiting short circuit protection
• Class 10 thermal overload protection
• Switching
• Signaling

The KTC9 has a fixed magnetic trip set at 18…22x the maximum value of the current adjustment range (as opposed to the KTA9s magnetic trip of approximately 14x adjustment range.) KTC9 are typically used in applications where nuisance tripping might occur, as with some high efficiency motors.

The KTB9 is designed without a thermal trip element (i.e., current adjustment range). It should be selected for applications where a separate motor overload protection device is used, such as on CLE7 Three Component Starters. Magnetic trip is approximately 14x operational current for the KTB9 (approximately 13x for the KTB7-45H).

KTV9 for use with VFDs

KTV9 series of self-protected combination motor controllers are suitable for application at the output of variable frequency drives (VFDs’) in multi-motor installations. They provide individual overload protection in multiple motor applications as required by NEC §430, part III

KTV9 self-protected combination motor controllers provide the following protective and control functions:

• Disconnect for motor branch circuit
• Branch-circuit, short-circuit protection (magnetic protection)
• Overload protection (thermal protection)
• Manual controller (ON/OFF)

The Sprecher+Schuh KTV9 series motor controllers are suitable for two types of applications under cULus listings:

• Manual, Self-protected Motor Controller
• Manual Motor Controller with approval for group installation (and as a motor disconnect)