Selection Guide
Electrical Ratings
69M for Air Systems
Furnas Brand Class 69M/69H Pressure Switches–Air Systems
The 69M pressure switch is used to reg-
ulate tank pressure between two preset
valves on small (up to 175 psi) electri-
cally driven air compressors. Unloader
valve to prevent compressors from start-
ing under load and auto-off disconnect
lever for manual cut off are optional. A
four port manifold which provides easy
relief valve and gauge mounting is also
available.
The rugged 69H pressure switch is
designed for the demanding require-
ments of larger, heavy duty commercial
compressors (up to 250 psi). Sturdy
painted steel case and cover resists the
harsh conditions encountered in indus-
trial applications. An unloader valve is
also available on the 69H.
69M Switch
Features Include:
• 3 and 5 HP 175 PSI maximum
• Corrosion resistant non-metallic cover
69H Switch Features Include:
• 5 Hp 250 PSI max.
• Rugged steel case and cover
Both Switches Feature:
• Easy adjustment
• No drift pressure settings
• Ample wiring room. 2 ground screws
• Visible contacts
• UL listed file #E14861
• CSA certified file LR36854
• Automatic unloader valve available
4269M/4269H
Min. Max. Pressure Setting
Horsepower
NEMA 1
Close Open Differential Adjustment 1 Phase 3 Phase Factory General Purpose
Cut-In Cut-Out Range Table
120V 240V 240V 480/600V
Setting Cat No.
25 psi 100 psi 20-40 psi E 1.5 2.0 3.0 – 80-100 69MB6
25 psi 100 psi 20-40 psi E 2.0 3.0 5.0 1.0 80-100 69MC6
40 psi 150 psi 30-40 psi F 1.5 2.0 3.0 – 95-125 69MB7
40 psi 150 psi 30-40 psi F 2.0 3.0 5.0 1.0 95-125 69MC7
50 psi 175 psi 35-55 psi G 1.5 2.0 3.0 – 115-150 69MB8
50 psi 175 psi 35-55 psi G 2.0 3.0 5.0 1.0 115-150 69MC8
Horsepower
Cat. Control 1 Phase 3 Phase DC
No. Circuit 112V 240V 240V 480-600V 32V-230V
69MB A600 1.5 2.0 3.0 – 1/4
69MC A600 2.0 3.0 5.0 1 1/2
69HA A600 2.0 3.0 5.0 5 2
69HB A600 2.0 5.0 5.0 5 2
69H for Air Systems
Min. Max. Pressure
Horsepower
NEMA 1 NEMA 1–with
Close Open Differential Adjustment 1 Phase 3 Phase Factory General Purpose Unloader Valve
Cut-In Cut-Out Range Table
120V 240V 240V 480/600V
Setting Cat No. Price $ Cat. No.
40 psi 250 psi 35-60 psi H 2.0 3.0 5.0 5.0 115-150 69HA1
69HAU1
40 psi 250 psi 35-60 psi H 2.0 5.0 5.0 5.0 115-150 69HB1
69HBU1
10 psi 125 psi 20-35 psi I 2.0 3.0 5.0 5.0 100-125 69HA2 69HAU2
10 psi 125 psi 20-35 psi I 2.0 5.0 5.0 5.0 100-125 69HB2 69HBU2
15 psi 60 psi 7-15 psi J 2.0 3.0 5.0 5.0 30-40 69HA3 69HAU3
15 psi 60 psi 7-15 psi J 2.0 5.0 5.0 5.0 30-40 69HB3 69HBU3
PSI Table E
Cut-In Cut-Out–B
A Min. Max.
20 40 60
30 50 70
40 60 80
50 70 90
60 80 100
70 90 100
80 100 100
PSI Table F
Cut-In Cut-Out–B
A Min. Max.
35 65 80
40 70 85
50 80 95
60 90 105
70 100 115
80 110 125
90 120 135
100 130 145
110 140 150
120 150 150
PSI Table G
Cut-In Cut-Out–B
A Min. Max.
45 75 100
55 85 110
65 95 120
75 105 130
85 115 140
95 130 150
105 140 160
115 150 170
125 160 175
PSI Table H
Cut-In Cut-Out–B
A Min. Max.
40 70 100
60 90 121
80 110 141
100 131 161
120 152 181
140 173 201
160 194 222
180 215 242
200 236 250
215 250 250
PSI Table I
Cut-In Cut-Out–B
A Min. Max.
82846
10 30 48
20 40 58
30 50 68
40 60 78
50 70 88
60 80 98
70 90 109
80 99 119
90 109 125
100 119 125
107 125 125
PSI Table J
Cut-In Cut-Out–B
A Min. Max.
14 20 30
20 26 36
25 31 41
30 36 46
35 41 51
40 46 57
45 51 60
50 57 60
53 60 60
Pressure Adjustment Settings
Screw A–Turn clockwise to increase and counterclockwise to
decrease pressure range (both cut-in and cut-out).
Differential Adjustment
Screw B–Turn clockwise to increase and counterclockwise to
decrease cut-out pressure.
NOTE: Differentials shown on tables above are averages only.
• 1/4 Femaile NPT
• 3/8 Female NPT w/ Pulsation orifice