Catalog 1308242
Issued 3-03
P&B
491
series
AC Coil 20 Amp PC Board or
Panel Mount Relay
File E38802
File LR75282
Users should thoroughly review the technical data before selecting a product part
number. It is recommended that user also seek out the pertinent approvals files of
the agencies/laboratories and review them to ensure the product meets the
requirements for a given application.
Features
• Up to 20 amp switching in SPST-NO and 13.3 amp in SPDT arrange-
ments.
• Washable, plastic sealed case available.
• Meets UL 873 and UL 508 spacing – 1/8" through air, 1/4" over surface.
• Load connections made via 1/4" Q. C. terminals.
• Choice of UL Class B or F insulation system.
• Well suited for various industrial, commercial and residential applications.
Coil Data
Nominal
Voltage
12
24
110
220
DC Resistance
±
10% (Ohms)
26
106
2,750
11,000
Must Operate
Voltage (Max.)
10.2
20.4
93.5
187
Must Release
Voltage (Min.)
1.8
3.6
16
33
Contact Ratings @ 23°C
Operate Data @ 25°C
Must Operate Voltage:
85% of nominal voltage or less.
Must Release Voltage:
15% of nominal voltage or more.
Operate Time (Including Bounce)§:
20 ms, max.
Release Time (Including Bounce)§:
15 ms, max.
§ At or From Nominal Coil Voltage
Arrangements:
1 Form A (SPST-NO), 1 Form B (SPST-NC) and 1 Form C
(SPDT).
Material:
Silver-cadmium oxide.
Mechanical Life:
10 million operations, at 300 ops/minute.
Electrical Life:
100,000 operations at factory rated load, 6 ops/minute.
Minimum Contact Load:
1A @ 5VDC or 12VAC.
Initial Contact Resistance:
50 milliohms @ 100mA, 6VDC).
Environmental Data
Storage Temperature Range:
-40°C to 130°C.
Operating Temperature Range
(1)
:
-55°C to +85°C.
Vibration, Operational:
0.065" (1.5mm) max. excursions from 10-55 Hz.
Shock, Operational:
10g for 11 ms.
Shock, Mechanical:
100g.
Contact Ratings @ 23°C with relay properly vented. Remove tape
from vent hole after soldering and cleaning.
Factory Contact Ratings
Voltage
240VAC
28VDC
1 Form A
20A
20A
1 Form B
(NO)
10A
6.7A
13.3A
13.3A
1 Form C
(NC)
6.7A
6.7A
Mechanical Data
Termination:
Printed circuit and quick connect terminals
(4)
.
Enclosures (all have 94V-0 flammability rating):
Open, unsealed dust cover or sealed case.
Weight:
1.2 oz. (33g) approx.
UL/CSA Contact Ratings
Voltage
240VAC
240VAC
240VAC
120VAC
240VAC
120VAC
120VAC
277VAC
28VDC
Load Type
General Purpose
Resistive *
Motor
Motor
LRA/FLA **
LRA/FLA
Tungsten *
Ballast
Resistive
1 Form A 1 Form B
30A
30A
2 HP
1 HP
80/30
98/22
TV5
10A
20A
15A
15A
1/2 HP
1/4 HP
30/10
–
TV3
3A
10A
1 Form C
(NO)
(NC)
20A
20A
2 HP
1 HP
50/20
–
TV5
10A
20A
10A
10A
1/2 HP
1/4 HP
20/7
–
TV3
3A
10A
Coil Temperature Rise
Initial Dielectric Strength
Between Open Contacts:
1,500V rms, 1 minute.
Between Contacts and Coil:
1,500V rms, 1 minute.
Initial Insulation Resistance
Between Mutually Insulated Elements:
10
9
ohms, min., @ 500VDC,
23°C and 50% R.H.
Notes
(1) Operating ambient temperature must consider must operate voltage
change over temperature, contact temperature rise, coil temperature rise
(If coil is not allowed to cool) and maximum coil temperature.
(2) Sealed relay terminals should not be bent.
(3) Remove tape after cleaning process for optimum life of sealed relays.
(4) Class B coils are UL systems approved for maximum coil temperature of
130°C, by change of resistance method. Class F coils are UL systems
approved for maximum coil temperature of 155°C, by change of resistance
method.
Specifications and availability
subject to change.
www.tycoelectronics.com
Technical support:
509
Refer to inside back cover.
Coil Data @ 23°C
Voltage:
12 to 220VAC.
Nominal Coil Power:
2.0VA, (approx.).
Maximum Coil Temperature
(4)
: Class B:
130°C.
Class F:
155°C.
Duty Cycle:
Continuous.
Dimensions are shown for
reference purposes only.
Dimensions are in inches over
(millimeters) unless otherwise
specified.
Catalog 1308242
Issued 3-03 (PDF Rev. 4-04)
P&B
Ordering Information
Typical Part Number
B
1. Basic Series:
491 = AC coil, printed circuit board/panel power relay.
2. Enclosure & Terminals:
1 = Dust Cover, PC terminal.
2 = Sealed Case, PC terminal.
6 = Sealed Case, Panel Mount, .110 Coil Terminal.
3. Contact Arrangement:
1 = 1 Form C (SPDT)
4. Coil Input:
P = 12VAC
Q = 24VAC
7 = Sealed Case, Panel Mount, .187 Coil Terminal.
8 = Open Unit
491
-1
1
G
2
00
4 = 1 Form
A
(SPST-NO)
T = 120VAC
5 = 1 Form
B
(SPST-NC)
U = 220VAC
5. Contacts:
2 = Silver-cadmium oxide
6. Coil Insulation and Special Features:
00 = Standard, UL Class B Coil Insulation System
F0 = Special, UL Class F Coil Insulation System
M0 = Magnetic Blowout (with enclosure 1 or 2 only, not UL or CSA)
A1 - E9 = Special - Customer Specific Features
Our authorized distributors are more likely to maintain the following items in stock for immediate delivery.
491-21T200
491-21Q200
491-24T200
491-24Q200
491-61T200
491-61Q200
491-64T200
491-64Q200
Outline Dimensions
Open Style
3 – .25 QC
(6.35)
.403
(10.24)
1.18 MAX.
(30 MAX.)
.9
(22.9)
1.22
(31.1)
.3
(7.7)
.7
(17.8)
.921
(23.4)
3 – .047
(1.2)
.11
(2.8)
.21
(5.4)
.63
(16.2)
.15
(3.8)
.4
(10.2)
2 – .024 DIA.
(.6)
Sealed Case for
PC Board Mounting
PC Board Layout (Bottom View)
1.08 MAX.
(27.5)
.138
(3.5)
1.10 MAX.
(28)
.11
(2.8)
.3
(7.7)
1.26 MAX.
(32.5)
.6
(2.54)
2 – .04 DIA.
(1)
3 – .08 DIA.
(2)
.25 QC
(6.35)
.24
(6.1)
.55
(17.8)
.7
(17.8)
Reference Only
Mounting Hole Pattern
Sealed Case for
Panel Mounting
1.71
(43.5)
.25 QC
(6.35)
1.99 MAX.
(50.3 MAX.)
.11 QC
(2.8)
1.08 MAX.
(27.5 MAX.)
1.10 MAX.
(28 MAX.)
2 – 0.12 (3.2) DIA. or M3
1.71
(43.5)
1.28 MAX.
(32.5 MAX.)
Wiring Diagrams (Bottom Views)
1 Form A
1 Form B
1 Form C
510
reference purposes only.
Dimensions are shown for
Dimensions are in inches over
(millimeters) unless otherwise
specified.
Specifications and availability
subject to change.
www.tycoelectronics.com
Technical support:
Refer to inside back cover.
MCU
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