TRUNKGUARD Series 300 Device Couplers (TG300)

deliver a fast and easy strategy to connect multiple fieldbus devices to a main fieldbus trunk in FOUNDATION fieldbus™ (H1) and PROFIBUS PA networks.

Designed for Zone 1 Areas

The TRUNKGUARD 300 Series Fieldbus Device Coupler is designed and approved for use in Zone 1 and Zone 2 with flameproof Exd devices. Each device coupler channel can be manually de-energized using a key-operated magnetic interlock. This allows individual fieldbus devices to be maintained without de-powering the entire segment even in Zone 1 areas. The fieldbus device coupler's LED indicators show the current state of each channel (NORMAL, FAULT or DE-ENERGIZED).

Industry-First Advantages

Available in a 4- or 8-spur configuration, the TRUNKGUARD 300 Series is the first to provide end of line sensing auto segment termination. The patented technology prevents fieldbus segment failure from under- or over-termination, a major problem in fieldbus startups. The TRUNKGUARD's auto-termination feature assures that local parts of a fieldbus segment will continue to function if remote parts of that segment are accidentally disconnected. This prevents costly downtime and hazardous situations. Other unique features include diagnostic LEDs that positively indicate power status on each fieldbus spur, spur short circuits, status of auto-termination, as well as convenient connections for a fieldbus hand-held configurator.

Short Circuit

ProtectionOn detection of excess current on a spur, the TG300 reacts immediately to switch spur current to a nominal trickle-level, rather than limiting the fault current to a fixed (and always higher) level as is typically done by competing units. With removal of the short, the spur is automatically reconnected to the fieldbus segment.

Easy Hazardous Area Installation

Housed in simple Ex e enclosures, safety approvals allow installation in Zone 1 and 2 locations with high power and Exd devices.