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14A-10
SEPTEMBER 2007 HUBBELL / CHANCE COMPANY – CENTRALIA, MISSOURI
®
®
POWER SYSTEMS, INC.
Horizontal
Mounting
Phase-over-Phase
Mounting
Riser Pole
Mounting
Application and Ratings
The Chance unitized D7 is a distribution-level, gang-operated, side-break switch for 15 through
38 kV applications. It is pre-assembled, adjusted, and mounted on a common support at the
factory for three-phase service. D7 switches meet a continuous-current rating of 600 amperes,
a momentary rating of 40,000 amperes, a three-second short time current rating of 25,000
amperes, and applicable NEMA and ANSI standards. It is available in 15 kV (110 kV LIW*),
27 kV (150 kV LIW*), 34.5kV (150kV LIW*) or 38 kV (200 kV LIW*). The D7 is a 600-ampere
loadbreak switch with the Duogap
®
expulsion interrupters. With the Duogap, the D7 is capable
of switching load currents up to 600 amperes, with full recovery voltage across the switch,
and interrupting transformer magnetizing and line-charging currents. This switch may be
used for disconnecting, line sectionalizing, circuit breaker bypassing, and isolating.
*Lightning Impulse Withstand (BIL)
Convenient Installation
Field installation time of this pre-assembled switch is greatly reduced below what is usually
required to install separate gang-operated distribution level switches. The three-phase unit is
conveniently raised in one piece to its mounting position, secured to the pole, control sections
attached, and eld adjustment made. Proper synchronization and phase spacing have been
made at the factory. Unitized switches are installed in 2 to 4 hours, compared to non-unitized
switches that take 6 to 8 hours.
One-lift installation cuts
time and cost of separate
gang-operated, distribution-
level switches.
Three mounting variations of the D7 are available.
Unitized and Pre-Assembled
Type D7 Switches — Unitized
15 to 38 kV 600 Amperes