14A-17
SEPTEMBER 2007
HUBBELL / CHANCE COMPANY – CENTRALIA, MISSOURI
®
®
POWER SYSTEMS, INC.
Type D6 Switches —
Non-Unitized
15 to 38 kV 600 Amperes
Application and Ratings
The Chance Type D6 is a distribution-level, gang-operated,
side-break switch for 15 through 38kV applications. D6
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 all applicable
NEMA and ANSI standards. It is available in 15 kV (110 kV
LIW*), 27 kV (150 kV LIW*) and 38 kV (200 kV LIW*). The
unit is a 600-ampere loadbreak switch with Duogap
®
expul
-
sion interrupters. Each switch comes prefitted with a socket
to accept the Duogap. Orders also may specify switches come
without the interrupters. With the Duogap, D6 is capable of
switching load currents up to 600 amperes, with full recov
-
ery voltage across the switch, and interrupting transformer
magnetizing and line-charging currents. The D6 switch may
be used for disconnecting, line sectionalizing, circuit breaker
bypassing, and isolating.
Design Features
D6 jaw socket and hinge terminal pads are bronze castings
with stainless steel supports. The blade is round tubular cop
-
per with flattened ends to allow for a silver/copper contact.
Silver contacts are used to ensure smooth, easy operation.
Bases and Bearings
The switch base for 38 kV (200 kV LIW*) is galvanized-steel
hat-section. A sealed, greaseless main bearing supports the
rotating insulator. The stainless-steel balls are encased in a
high-strength, heat-treated aluminum housing for mainte
-
nance-free operation. The switch base for 15 kV (110 kV LIW*)
and 27 kV (150 kV LIW*) is extruded aluminum channel and
the bearings are high-density Delrin.
Insulators
Alternate Mounting Arrangements
The standard D6 switch design allows for a multitude of mounting and control configurations. The switch can be mounted
horizontally or vertically. Controls can be installed on any side of the pole or off the switch ends for structure mount.
Some common configurations are shown below. Consult factory for other requirements.
38 kV (200 kV LIW*) Switch Phase
15 kV (110 kV LIW*) Switch Phase
27 kV (150 kV LIW*) Switch Phase
The Sky-Glaze
®
insulator is gray porcelain NEMA 3-inch
BC.
Blade Opening
All side-break D6 switches open in the counter-clockwise
direction.
Terminal Pads, Arcing Horn
NEMA-standard, two-hole terminal pads accept aluminum
or bronze connectors. Tin-plated bronze D6 pads reduce
resistance to assure efficient current transfer. A stainless
steel arcing horn picks up load current, preventing burning
or arc pitting on the main contacts.
Interrupters
Chance Duogap
®
expulsion interrupter makes the D6 a
loadbreak switch. Built-in sockets on each switch accept the
interrupter. The Duogap may be ordered with the switch or
may be hotstick-installed for load management conversion.
For more on the Duogap, see Bulletin No.14-9405.
*Lightning Impulse Withstand