DC88 Monoblock Single Pole Double Throw for Motor Reversing0 pages

100A

Application

Interrupted

Thermal Current Rating (Ith)

Uninterrupted

100A

Intermittent Current Rating:
30% Duty

185A

40% Duty

160A

50% Duty

140A

60% Duty

130A

70% Duty

120A

Rated Fault Current Breaking Capacity (Icn) 5ms Time Constant:
(in accordance with UL583*)
DC88

The DC88 motor reversing type of contactor
has been designed for direct current loads,
particularly motors as used on electric
vehicles such as industrial trucks. The DC88 is a
monoblock construction, resulting in a
compact design which is compatible with
modern electronic control systems. Developed
for both interrupted and uninterrupted loads,
the DC88 is suitable for switching Resistive,
Capacitive and Inductive loads.
•t

Interrupted current - opening and closing
on load with frequent switching (results in
increased contact resistance).

•t

800A at 48V

DC88B

Uninterrupted current - no or infrequent load
switching requirements (maintains a lower
contact resistance).

600A at 80V

Maximum Recommended Contact Voltages (Ue):
DC88

48V D.C.

DC88B

96V D.C.

Typical Voltage Drop per pole across New Contacts at 100A:
Normally Open

< 40mV

Normally Closed

< 50mV

Mechanical M.T.B.F

DC88 Monoblock Single Pole Double Throw for Motor Reversing
(Part of the SW80 Series)

>5 x 106

Coil Voltage Available (Us)
(Rectifier board required for A.C.)

DC88A (with integral bracket)

From 6 to 240V D.C.

The main contact circuit, designed for motor
reversing, has a built in failsafe, so that if both
coils are energised simultaneously the contact
arrangement is open circuit. The DC88 has
double breaking main contacts with silver
alloy contact tips, which are weld resistant, hard
wearing and have excellent conductivity. The
DC88 M8 main stud terminals can be configured
in a variety of ways in order to suit the application.
Coil connections are by means of 6.3mm spades
and mounting is via the supplied bracket and can
be horizontal or vertical, when vertical the M8
contact studs should point upwards. If the
requirement is for downwards orientation we can
adjust the contactor to compensate for this.

Coil Power Dissipation:
Highly Intermittent Rated Types

20 - 30 Watts

Intermittently Rated types

15 - 20 Watts

Prolonged Rated Types

13 - 15 Watts

Continuously Rated Types

7 - 13 Watts

Maximum Pull-In Voltage (Coil at 20˚ C) Guideline:
Highly Intermittent Rated types
(Max 25% Duty Cycle)

60% Us

Intermittently Rated types
(Max 70% Duty Cycle)

60% Us

Prolonged Operation
(Max 90% Duty Cycle)

60% Us

Continuously Rated Types
(100% Duty Cycle)

66% Us

Drop-Out Voltage Range

10 - 25% Us

Typical Pull-In Time

20ms

Typical Drop-Out Time (N/O Contacts to Open):
Without Suppression

DC88 (with optional tapped holes)

5ms

With Diode Suppression

50ms

With Diode and Resistor
(Subject to resistance value)

DC88 Available Options

DC88 Contactor Performance

8 - 20ms

Normally Closed to Normally Open

7ms

800

Normally Open to Normally Closed

4ms

700

General

900

3ms
- 40˚C to + 60˚C

Guideline Contactor Weight:
990 gms
+ 20 gms
+ 50 gms

Armature Cap

400

Mounting Brackets
(See overleaf)

○

Magnetic Latching† (Not fail safe)

○
○

M

○

P

200

Auxiliary Contact Switching Capabilities (Resistive Load):

Contact Performance Key:

5A at 24V D.C.
2A at 48V D.C.
0.5A at 240V D.C.
Connection Conductor Sizes for Maximum Continuous Current
Should be Rated Suitable for Application
Key:

= Interrupted

Interrupted and
Uninterrupted
Current

= Uninterrupted

Note: Where applicable values shown are at 20˚C

* Please check our web site for product UL status
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•t
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v1a-06-13

Performance data provided should be used as a guide only. Some de-rating or variation
from figures may be necessary according to application.
Thermal current ratings stated are dependant upon the size of conductor being used
For further technical advice email: technical@albrightinternational.com
Albright reserve the right to change data without prior notice

80
0

0

0

70

Current (Amperes)

60

0

0

0
5A

Closed Contact Housing‡
Environmentally Protected IP66
(see DC88P-1000 Catalogue sheet)

100

Auxiliary Details
Auxiliary Thermal Current Rating

Magnetic Blowouts - High Powered†

300

50

With Blowouts

500

40
0

Per Auxiliary

A

○
○
○

600

30
0

DC88

X

Magnetic Blowouts†

Figures are for guideline
purposes only

○

Auxiliary Contacts - V3

20
0

Operating Ambient Temperature

Suffix

Auxiliary Contacts

10
0

Typical Contact Bounce Period

Time (Seconds)

Typical Main Contact Changeover Time (milliseconds):

B

○

EE Type (Steel Shroud)
Contacts

○
○

Large Tips
Connection Diagram

B

Textured Tips
Silver Plating

L
T

X
Coil

○
○
○
○

AC Rectifier Board (Fitted)
Coil Suppression†
Flying Leads
Manual Override Operation
M4 Stud Terminals

X

M5 Terminal Board

F

○
○

Vacuum Impregnation
Key: Optional

○

Standard

●

Not Available X

†

Connections become polarity sensitive

‡

Open Housing Available

Albright International Ltd, Evingar Trading Estate, Ardglen Road, Whitchurch, Hampshire, RG28 +44 UK
Albright International, 125 Red Lion Road, Surbiton, Surrey KT6 7QS, England,Tel: +44 (0) 20 8390 5357, Fax:7BB,(0) 20 8390 1927
Tel: sales@albrightinternational.com or technical@albrightinternational.com Web 890030, Fax: +44 (0)1256 890043
E-mail: +44 (0)1256 893060, Fax: +44 (0)1256 893562, Dedicated Sales Tel: +44 (0)1256 Site: www.albrightinternational.com
E-mail: sales@albrightinternational.com or technical@albrightinternational.com Web Site: www.albrightinternational.com
Copyright © 2010 Albright International Ltd
Copyright © 2013 Albright International LTD

DC88