GENERAL
MELTRIC’s DN7c, DN9c and DN20c Series indus-
trial, multipin plugs and receptacles are designed to
ensure safety and provide reliable electrical connections.
Please follow the instructions below to ensure proper
installation and safe use of the product.
There are inherent dangers
associated with electrical prod-
ucts. Failure to follow safety precautions can result
in serious injury or death. These instructions must be
followed to ensure the safe and proper installation,
operation and maintenance of the MELTRIC devices.
Before installation, disconnect all sources of power to
the circuit to eliminate the risk of electrical shock.
RATINGS
The DN9c and DN20c products are manufactured
and load-break rated in compliance with CSA
Standard C22.2 No. 182.1. The DN7c product is
manufactured and rated in compliance with CE
Standards IEC 60309-1. The product ratings are
indicated on the device’s labels. Additionally the
DN9c and DN20c are HP rated for multiple HP loads
as long as any single HP load doesn’t exceed the
levels shown in Table 1. Their short circuit withstand
levels and fuse ratings are shown in Table 2.
INSTALLATION
These products should be installed by qualified
personnel in accordance with all applicable
local, state and national electrical codes.
Before starting, verify that the power is turned off; the
product ratings are appropriate for the application;
and the conductor sizes are within the capacities of
the terminals noted on Table 3.
General Notes & Precautions
1. Self-tapping screws are provided for use with
some polymeric accessories.
NOTICE:
Once
they are seated, care should be taken in order
to avoid over-tightening them against the
plastic material.
2 Various handles, cord grips or strain relief
options may be used. These instructions are
based on handles provided with integral,
multi- layer, bushing cord grips.
3. Wire strip lengths are indicated in Table 4.
Strip lengths for cable sheathing will depend
on the specific application.
4. Wiring terminals are spring-assisted to prevent
loosening due to wire strand settlement, vibration
and thermal cycling.
NOTICE:
They should not
be over-tightened. Appropriate tools and tighten-
ing torques are indicated in Table 5.
The DN9c and DN20c plugs and receptacles’ contacts
are labeled with F or S numbers respectively. The
F-number on the inlet has a corresponding S-number
on the receptacle. See table 6 for details.
Assembly for In-line Connections
Do not overtighten terminal or self-tapping
screws. Tighten screws to the proper torque to
ensure a secure connection.
When the DN9 and 50A DN7c products are used
as in-line connectors, finger drawplates should be
installed on both the receptacle and plug in order
to provide the user with the leverage to connect the
device (finger drawplates are not available).
NOTICE:
The longer screws provided with the finger
drawplates must be used when assembling devices
with finger drawplates because the shorter screws
provided with the handle are not long enough to
properly secure both the handle and drawplates to the
inlet or receptacle and achieve a watertight connection.
Adjust the bushing diameter to fit the cable by removing
the inner sections as required. Insert the bushing
into the strain relief, then insert the assembly into
the handle and loosely install the compression nut.
Insert the cable through the handle, the thin black
(neoprene) drawplate gasket, the finger drawplate
(if applicable) and the color coded gasket. Strip the
cable sheath to provide a workable wire length, being
mindful that the sheath must extend into the handle
to achieve a secure cord grip. Then strip the individu-
al wires to the lengths indicated in Table 2 and twist
the strands of each conductor together.
Back out the terminal screws on the receptacle (or
inlet) far enough (but not completely) to allow the
conductors to pass. Insert the conductors fully into
their respective terminals and tighten the terminal
screws with the appropriate tool to the torque
indicated in Table 3.
Verify that the cable sheath extends beyond the strain
relief and into the handle. Assemble the receptacle
(or inlet), the color coded gasket, followed by the
finger drawplate, and the thin black (neoprene)
drawplate gasket (if applicable) to the handle and
tighten the compression nut to secure the cable.
Assembly for Mounted Receptacles (or Inlets)
In applications where the receptacles (or inlets) are
mounted to wall boxes, panels or other equipment,
optimal operation is achieved when the devices are
installed with the latch at the top.
Insert the cable or wires through the wall box and cut
to allow adequate length. Strip the cable sheath as
Compression
Nut
Handle
Strain
Relief
Color-Coded
Gasket
Receptacle
(or Inlet)
Bushing
Finger Drawplate Gasket
Finger Drawplate
Mount with the latching pawl at
the top to counteract the weight
and strain of the plug & cable.
Mount the receptacle
at a downward angle
whenever possible.
Table 4 - Wire Strip Length – Dimensions A
Receptacle Plug/Inlet
Device/Contacts
Inches mm Inches mm
DN7c (50A) Contact 3/4 20 3/4 20
DN9c Contacts
1/2
13
1/2
13
DN20c Contacts
1/2
13
1/2
13
Table 5 - Terminal Screw Tightening Torques
Torque
Required Screwdriver
Device/Contact in-lbs N-m
or Allen Wrench
DN7c (50A) Contact
13.3
1.5 5/64" hex head 2mm hex head
DN9c
Contact
4.50
0.5 5/64" hex head 2mm hex head
DN20c
Contact
4.50
0.5 5/64" hex head 2mm hex head
Table 6 - DN9c & DN20c Wiring
Plug/Inlet Corresponding Receptacle
Contact Nos.
mating pin
Contact Nos.
F1 (Ground)
S1 (Ground)
F2
S2
F3
S3
F4-19
S4-19
F20
S20
OPERATING INSTRUCTIONS
DN7C/DN9C/DN20C
MULTIPIN
Table 2 — Short Circuit Withstand Ratings
Device
Rating Fuse
Type*
DN9c
10 kA @ 480 VAC
DN20c
10 kA @ 480 VAC
* Ratings applies with fusing up to this amperage. Ratings are based
on tests performed with Ferraz Shawmut current limiting fuses.
RK1 NTD 35 A
RK5 TD 20 A
RK1 NTD 35 A
RK5 TD 20 A
Table 1 — Maximum HP at Rated Voltage Levels
1-Phase
Device 120 V
208 V 240 V
277 V 480 V
HP FLA HP FLA HP FLA HP FLA HP FLA
(A) (A) (A) (A) (A)
DN9c 1/2 9.8 1 8.8 1.5 10 2 10 3 8.5
DN20c 1/6 4.4 1/3 4 1/2 4.9 1/2 3.9 1.5 5
3-Phase
Device
208 V
240 V
480 V
HP FLA
HP FLA
HP FLA
(A) (A) (A)
DN9c
2 7.5
3 9.6
5 7.6
DN20c
1 4.6
1 4.2
3 4.8
WARNING
DANGER
CAUTION
NOTICE
ADVERTENCIA
DANGER
CAUTION
AVISO
WARNING
DANGER
CAUTION
NOTICE
ADVERTENCIA
DANGER
CAUTION
AVISO
WARNING
DANGER
CAUTION
NOTICE
ADVERTENCIA
DANGER
CAUTION
AVISO
MELTRIC Corporation
/ 4765 W. Oakwood Park Drive Franklin, WI 53132
Tel. : 800 433 7642 / Fax : 414 433 2701 / e-mail : mail@meltric.com
INSDN K
A manufacturer of products using
Marechal technology
A company of MARECHAL ELECTRIC GROUP
meltric
.com
Table 3 — Wiring Terminal Capacity* (in AWG)
Contacts
Device
Min Max
DN7c (50A)
10
6
DN9c
16 10
DN20c
16 10
*Capacity is based on THHN wire sizes.
