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Glass Bells

Toughened Glass Insulators

Toughened or tempered glass bells are produced with a process of controlled thermal treatment to increase its strength compared to normal glass. There are pre-stresses induced to the glass bell via a quick but controlled cooling of the heated glass. This tempering puts the outside surface into compression and inside surface into tension. Any sudden mechanical or electrical shock causes the bell to break into small defined particles and not into splinters like regular glass.

ANSI & CSA standards
70/100kN (15,000 to 22,000 pounds)

Profile Standard Anti-Pollution
Type Ball & Socket Clevis & Tongue Ball & Socket Clevis & Tongue Medium High
Catalog Number PSN70146 PSCT70146 PSN100146 PSCT100146 PSN100P146 PSN100PP146
Class ANSI C29.2B 52-3 L 52-4 L 52-3 H 52-4 H - -
CSA Type CS-3* - - - - -
Minimum electromechanical failing load kN (lbs) 70 (15,000) 70 (15,000) 100 (22,000) 100 (22,000) 100 (22,000) 100 (22,000)
Spacing mm (inch) 146 (5-3/4) 146 (5-3/4) 146 (5-3/4) 146 (5-3/4) 146 (5-3/4) 146 (5-3/4)
Diameter mm (inch) 255 (10) 255 (10) 255 (10) 255 (10) 255 (10) 280 (11) 
Creepage mm (inch) 320 (12-5/8) 320 (12-5/8) 320 (12-5/8) 320 (12-5/8) 390 (15-11/32) 445 (17-1/2)
ANSI C29.2 Insulation Type B - B - B B
Electromechanical Resistance kN (lbs) 70 (15,000) 70 (15,000) 100 (22,000) 100 (22,000) 100 (22,000) 100 (22,000)
Mechanical Impact Strength N-m (in-lbs) 45 (400) 45 (400) 45 (400) 45 (400) 45 (400) 45 (400)
Routine Test kN (lbs) 35 (7,500) 35 (7,500) 50 (11,000) 50 (11,000) 50 (11,000) 50 (11,000)
Time Load kN (lbs) 45 (10,000) 45 (10,000) 70 (15,000) 70 (15,000) 70 (15,000) 70 (15,000)
Power Frequency Dry (kV) 80 80 80 80 95 100
Power Frequency Wet (kV) 50 50 50 50 55 60
Critical Flashover Positive (kV) 125 125 125 125 140 140
Critical Flashover Negative (kV) 130 130 130 130 120 140
Puncture voltage in oil (kV) 130 130 130 130 130 130
RIV Test Voltage RMS to Ground (kV) 10 10 10 10 10 10
Maximum RIV at 1000 kHz (µV) 50 50 50 50 50 50
Approximate Net Weight kg (lbs) 3.4 (7.6) 3.4 (7.6) 3.8 (8.4) 3.8 (8.4) 4.8 (10.7) 5.6 (12.3)
Number of Insulators per crate 6 6 6 6 6 6

ANSI & CSA standards
120/160/220kN (25,000 / 36,000 / 50,000 pounds)

Profile Standard Anti-Pollution Standard Anti-Pollution Standard
Type Ball & Socket Clevis & Tongue Medium High Ball & Socket Medium Ball & Socket
Catalog Number PSN12146 PSCT12146 PSN120P146 PSN120PP146 PSN160146 PSN160P171 PSN21156
Class ANSI C29.2B 52-5 L 52-6 L - - 52-8 L - 52-11
CSA Type CS-5* CS-6* - - CS-8* - CS-11*
Minimum electromechanical failing load kN (lbs) 120 (25,000) 120 (25,000) 120 (25,000) 120 (25,000) 160 (36,000) 160 (36,000) 220 (50,000)
Spacing mm (inch) 146 (5-3/4) 146 (5-3/4) 146 (5-3/4) 146 (5-3/4) 146 (5-3/4) 171 (6-3/4) 156 (6-1/8)
Diameter mm (inch) 255 (10) 255 (10) 255 (10) 280 (11) 280 (11) 320 (12-5/8) 280 (11) 
Creepage mm (inch) 320 (12-5/8) 320 (12-5/8) 390 (15-11/32) 445 (17-1/2) 380 (15) 545 (21-1/2) 380 (15)
ANSI C29.2 Insulation Type J - J J K K K
Electromechanical Resistance kN (lbs) 120 (25,000) 120 (25,000) 120 (25,000) 120 (25,000) 160 (36,000) 160 (36,000) 220 (50,000)
Mechanical Impact Strength N-m (in-lbs) 45 (400) 45 (400) 45 (400) 45 (400) 45 (400) 45 (400) 45 (400)
Routine Test kN (lbs) 60 (12,500) 60 (12,500) 60 (12,500) 60 (12,500) 80 (18,000) 80 (18,000) 110 (25,000)
Time Load kN (lbs) 70 (15,000) 70 (15,000) 70 (15,000) 70 (15,000) 110 (24,000) 110 (24,000) 135 (30,000)
Power Frequency Dry (kV) 80 80 95 100 80 105 80
Power Frequency Wet (kV) 50 50 55 60 50 65 50
Critical Flashover Positive (kV) 125 125 140 140 125 170 140
Critical Flashover Negative (kV) 130 130 120 140 130 160 140
Puncture voltage in oil (kV) 130 130 130 130 130 130 130
RIV Test Voltage RMS to Ground (kV) 10 10 10 10 10 10 10
Maximum RIV at 1000 kHz (µV) 50 50 50 50 50 50 50
Approximate Net Weight kg (lbs) 3.9 (8.6) 3.9 (8.6) 4.9 (10.8) 5.8 (12.8) 6.3 (13.9) 8.3 (18.3) 7.5 (16.5)
Number of Insulators per crate 6 6 6 6 6 6 6
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Insulators