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221
Pressure and Differential
Pressure Switches, Watertight
Enclosure, Type 400, B-Series
This general purpose Ashcroft®
switch series is ideal for use in
virtually all Industrial and OEM
applications.
• Watertight NEMA 4X enclosure,
IP66
• Choice of switch elements for all
applications, including hermetically sealed
• Wide choice of wetted materials,
including all-welded Monel or
stainless steel
• Fixed or limited adjustable
deadband
(8)
• Approved for UL, CSA and FM
ratings
• Setpoints adjustable from 15-100%
of range
1 - ENCLOSURE
B4 - Pressure switch, type 400, watertight
enclosure meets NEMA 3, 4, 4X and 13,
IP66 requirements
D4 - Differential pressure switch, type 400,
watertight enclosure meets NEMA 3, 4, 4X
and 13, IP66 requirements
2 - SWITCH ELEMENTS
Order Description/Maximum Electrical Ratings
Code UL/CSA Listed SPDT
(4)
20
21
Hermetically sealed
22
deadband
23 Heavy duty ac 20A,125/250 Vac
15A,125/250/480 Vac
24
1/4A, 250 Vdc
25 Heavy duty dc 10A,125/ Vac or dc
1/8HP 125/ Vac or dc
26
proof
27 High temp. 300°F 15A, 125/250 Vac
28
on increasing
29 Manual reset trip 15A, 125/250 Vac
on decreasing
31 Low level (gold) 1A,125/250 Vac
contacts
Hermetically sealed
32 switch, general 11A, 125/250 Vac
purpose 5A, 30 Vdc
50 Variable deadband 15A,125/250 Vac
61
62
ment proof
63 Dual high temp. 300°F 15A, 125/250 Vac
15A,125/250/480 Vac
64 Dual general purpose 1/2A, 125 Vdc
1/4A, 250 Vdc
65 Dual ammonia service 5A, 125/250/480
Narrow deadband 15A, 125/250 Vac
(9)
Ammonia service 5A, 125/250 Vac
(3)
switch, narrow 5A, 125/250 Vac
(1)
General purpose 1/2A, 125 Vdc
(4)
Sealed environment 15A, 125/250 Vac
Manual reset trip 15A, 125/250 Vac
UL/CSA Listed Dual SPDT
(4)
Dual narrow deadband 15A, 125/250 Vac
(4)
Dual narrow environ- 15A, 125/250 Vac
(2)
• Choice of actuators, including
designs for fire-safe and NACE
applications
(8)
• Readily available
• Standard pressure connection
materials:
Pressure psi ranges
- 316L stainless steel
Differential psid ranges
- Nickel-plated brass
(9)
Pressure and differential inches
of water ranges
- Epoxy coated carbon steel
3 - ACTUATOR SEAL
Code Process
& Temp.
Material Limits in.H
°F psi
B-Buna N 0 to 150
V-Viton 20 to 300 ● ● ●
T-Teflon 0 to 150 ● ● ● ●
(5)(10)
S-SS
0 to 300 ●
(5)(10)
P-Monel
(7)
(6)
Vac 0-600 1000 2000-
O psi psi 3000
2
● ● ● ●
0 to 300 ●
4 - OPTIONS
(See pages 238-239)
5 - STANDARD PRESSURE RANGES
(See page 235)
NOTES:
1. Standard switch.
2. Dual switches are 2 SPDT snap-action switches not
independently adjustable.
3. Estimated dc rating, 2.5A, 28 Vdc (not UL listed).
4. Estimated dc rating, .4A, 120 Vdc (not UL listed).
5. Available on pressure only.
6. Ambient operating temperature limits –20 to 150°F,
all styles. Setpoint shift of ±1% of range per 50°F
is normal. Switch calibrated at 70°F reference.
7. Items are wetted by process fluid.
8. Refer to Option Table.
9. Order Option XUD, stainless steel process connection.
10. On differential switches, stainless steel is
available in 15, 30, 60 and 90 psid ranges only.
Includes Teflon O-ring and 316 SS connection.
TO ORDER THIS B-SERIES PRESSURE SWITCH:
Range
●
●
HERMETICALLY SEALED SWITCH
We recommend hermetically sealed switch elements
for improved reliability. The hermetically sealed switch
provides uncompromising contact protection in harsh
or corrosive environments. The Ashcroft 400 Series is
also approved for installation in Division II hazardous
areas when supplied with hermetically sealed contacts.
Features:
• UL-recognized component,
guide WSQ2, File E85076
• All-stainless steel welded
construction
Select: B4 20 B XPK 600#
1. Enclosure:
2. Switch Element:
3. Actuator Seal:
4. Options
5. Pressure Range
(See pages 238-239):
(See page 235):
Consult factory for guidance in product selection
Phone (203) 385-0217, Fax (203) 385-0602 or
visit our web site at www.ashcroft.com
LOOK FOR THIS AGENCY
MARK ON OUR PRODUCTS