

Selenium Rectifier
The H and W series are the result of continuous research and development programme aimed at reliable, low-cost, compact selenium rectifier elements and stacks. High standard of quality are further insured by Westing house plants & machinery and the expert technical know-how available at Insel Rectifiers.
The aluminium based selenium rectifier elements are manufactured by an improved, closely controlled vaccum deposition process. This new process ensure stable, non- ageing, low loss characteristics permitting higher current density operation while maintaining a reliability standard which has been a by in the selenium rectifier field for over thirty years.
IRI selenium rectifier ’s elements are available in two categories, series H & w. Both series are available in Voltage grades up to 36 volts.
Our Products
H | O | G | LA | 06 | B | 01 |
H | O | G | LA | 06 | B | 01 |
Rectifiers Series | Max. RMS input Voltage per series element | Element Code | Mechanical structure/ spacing | Number of series elements per arm | Circuit Arrangement | Number of parallel path per arm |
H— | 0—22 | C | L | 2Digits | Single Phase | 2 Digits |
Normal | D | LA | A-Half wave | |||
Current | E | B- Brige –ve Outer | ||||
Density | 1—30 | G | C-Centretap –veCommon | |||
K | ||||||
M | N-Centretap | |||||
Q | -ve common | |||||
2—36 | R | D-Voltage doubler | ||||
W- Higher | Y | Three Phase | ||||
Current Density | S | G- bridge | ||||
3—25 | N | E- Halfwave +ve Outer | ||||
T | R- Half Bridge –ve Outer | |||||
P | S– Hexaphase | |||||
4– 33 |
CURRENT RATING OF IRI ELEMENTS IN STACKS
RIES | GRADE | Elements | Active Area in Sq.com | Mech. Structure | Maximum recom- mended elements in stack | Single Phase | 3 Phase Bridge & Half Wave | Hexa Phase | ||
Dim.In mm | Half Wave | Bridge | ||||||||
‘H’ SERIES | IN 0,1,2,3, &,4 Volatage grades | C D E F G K M Q R Y S N T P | 17×17 23X23 36X23 36X36 50X50 76X50 76X76 100Z62 102X76 100×83 100×100 152×76 152×100 305×76 | 1.9 4.0 6.75 11 23 35 50 62 80 74 90 107 152 221 | L L LA L L L LA L LA L LA L LA L LA L LA L LA L LA L LA L LA | 40 40 40 40 40 40 32 40 32 40 32 40 32 42 32 42 32 42 32 42 32 42 32 42 32 | 0.08 0.23 0.30 0.52 0.65 1.10 1.35 1.65 2.02 2.75 3.00 3.00 3.30 3.50 4.00 3.75 4.50 4.00 5.00 5.50 6.00 6.00 7.50 10.25 12.30 | 0.16 0.46 0.60 1.04 1.35 2.20 2.50 3.30 3.75 5.50 6.00 6.00 6.60 7.00 8.00 7.50 9.00 8.00 10.00 11.00 12.00 12.00 15.00 20.50 24.60 | 0.24 0.51 0.75 1.38 1.75 2.85 3.15 4.27 4.82 7.15 8.50 8.00 8.80 10.70 12.00 11.25 13.50 12.00 15.00 14.30 18.00 18.00 22.00 26.65 35.00 | 0.35 1.02 1.50 2.76 3.50 5.70 6.30 8.55 9.45 14.30 17.10 16.00 18.00 21.45 24.00 22.50 27.00 24.00 30.00 28.60 34.00 36.00 44.00 53.20 63.85 |
Note:
1. For ‘W’ Series add 40% to the current rating given above for ‘H’ Series.
2. The rating above are at an ambient temperature of 450 degree C
Circuit | Formula | AC\DC Current Ratio (1) | Ripple Percent(2) | n (Approx) |
SINGLE PHASE | ||||
Half Wave | VL= 2.22 | 2.22E |
Ve ( E+nVf)1.57121 Centre- tapVL= 2.22 2.22
Ve (E=2nVf)0.8048 BridgeVL= 1.11 1.11E
Ve ( E=4nvf)1.12548 THREE PHASE Half WaveVL= 1.48 1.48E
Ve ( E+3nVf)0.6018.3 BridgeVL= 0.742 0.742E
Ve (E+6nVf)0.804.2
VL = on – load a.c. input voltage ( total secondary voltage for single phase center – tap line- to line for three phase half wave and bridge)
E = mean d.c. output voltage .
Vf = mean element forward voltage drop.
N = number of series elements .
Ve = Voltage of plate
(1) = | a.c. input curre d.c. output current |
(2) = | a.c. ripple voltage – r.m.s. x 100 mean d.c. output voltage |
PlateType | Mechstructure | Fig.Ref. | Width(W)mm | Height(W)mm | F.L(Cx2) +PXN | Pitch(P)mm | SpindleDia(D) | EProjections on both sides mm |
C D E F G K M Q R Y S N T P | L L LA L L L LA L LA L LA L LA L LA L LA L LA L LA L LA L LA L | 6 6 6 4 6 2 2 4 4 2 2 5 5 5 5 5 5 2 2 4 4 5 5 1 1 | 17 23 23 36 36 50 50 50 50 76 76 62 62 76 76 83 83 100 100 152 152 100 100 381 381 | 32 35 35 35 48 68 68 100 100 100 100 122 122 122 122 122 122 122 122 100 100 185 185 100 10 | 32+PxN 32+PxN 32+PxN 32+PxN 32+PxN 20+PxN 20+PxN 20+PxN 20+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 45+PxN 51+PxN 51+PxN | 2.5 3. 35 5.8 5.8 7.1 7.0 8.5 7.0 8.5 9.9 12.2 12.2 17.3 9.9 12.2 9.9 12.2 12.2 17.3 12.2 17.3 12.2 17.3 9.9 12.2 | 3/16 3\16 3\16 3\16 3\16 1/4 1/4 1/4 1/4 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 | 10 10 10 10 10 15 15 15 15 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |
N = Number of plates in stack
F.L. = Fixing Length
C = End assembly length
P = Plate Distance
Rectifiers with 4 or less than 4 plates shall be screw / bolt mounted