The motor run capacitors manufactured by this company are produced using the latest technology and in accordance with the international standard IEC60252.
The dielectric of these capacitors is composed of polypropylene film (BOPP) in micron thicknesses and the capacitor plate which is made of a very thin metal coating (less than 0.3µm). In the vacuum environment, the alloy metal vapor is deposited on a polypropylene film and capacitor plates are formed.
One of the biggest advantages of this technology is the dielectric self-healing feature of the capacitor, this means that, in case of insulation failure in the dielectric film, by producing local heat and evaporating of the metal layer in the area of insulation failure, the short circuit is removed and insulation failure is repaired.
The self-healing occurs in less than 0.01 second and according to the area of capacitor plate and the surface of the evaporated part; there is no significant reduction in capacitance.
The most important application of these capacitors is to start single-phase inductive motors and small three-phase asynchronous motors with single-phase supply.
Capacitor installation causes a phase difference and the required rotating magnetic field in the motors and provide the necessary torque, to cause the motor to rotate.
In selecting the nominal voltage of the capacitor, it should be noted that the applied voltage to the capacitor terminals is generally higher than the supply voltage.
In single-phase motors equipped with permanent working capacitors, the capacitor always remains in series with the auxiliary winding in circuit.
Capacitance should not be too high to prevent overload on the auxiliary winding.
The starting torque in these motors is usually 50 to 70% of the nominal value.
Motor efficiency is 90% of similar three-phase motors and the power factor is always close to one and there is no need to compensate.
Therefore, Rahshad capacitors which are designed and manufactured for this purpose have the ability to withstand high overload, low losses and high thermal stability. It is sometimes necessary to start a three-phase synchronous motor with a single-phase power supply. Small three-phase synchronous motors (with a power of less than 1.5 kW) can be connected to a single-phase grid by using a capacitor.
The capacitor can be moved on the motor capacitors to reverse the direction of motor rotation. The power obtained in this case is 70 to 80% of the three-phase nominal power and 25 to 30% of the nominal torque.
| Technical specifications | |
| Nominal Voltage (Un) | 400 – 450 and 500 VAC (Other on request ) |
| Nominal Frequency (Fn) | 50 ~ 60 Hz |
| Capacitance Tolerance | ± 5 % & ± 10 % (Other on request) |
| Operating Temperature(°C) | – 25°C/+70°C & -25°C /+85°C |
| Life Expectancy | Class A: 30000 h Class B: 10000 h Class C: 3000 h Class D: 1000 h |
| Dissipation Factor(tg δ) | Less than 20 × 10-4 at 50 Hz |
| Test Voltage Between Terminals | 2 Un for 2 seconds. |
| Test Voltage Between Terminals and Casing | 2 kVAC for 2 seconds. |
| Max. Permissible Over Voltage | 1.1 Un |
| Max. Permissible Over Current | 1.3 In (Nominal current) |
| Casing | Flame retardant materials according to the latest version of the standard |
| Electrical Connection | Wire, Cable, Single and Double tag, Cap |
| Mechanical Connection | M8 aluminum or plastic bolt, Without screw, Fast connection |
| Filling Material | Polyurethane resin |
| Environmental Compatibility | No Leakage and Non-PCB |
Capacitor power in case of permissible over loads should not be more than 1.35 times the nominal power.
| Round Capacitor | Flat Capacitor | ||||||||||
| Model | MRP
400-450VAC |
Model | MRP
450-500VAC |
Model | MFP
400-450VAC |
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| Capacitance
(µf) |
Dimensions
H * D (mm ) |
Qty per
Box(pcs) |
Weight
Per each (gr) 5%± |
Capacitance
(µf) |
Dimension
H * D (mm ) |
Qty per
Box(pcs) |
Weight
Per each (gr) 5%± |
Capacitance
(µf) |
Dimensions
H * T * W (mm ) |
Pcs. In
Box |
Weight
Per each (gr) 5%± |
| 1 | 25 × 60 | 288 | 32 | 1 | 25 × 60 | 288 | 30 | 1 | 38 × 14 × 28 | 500 | 17 |
| 2 | 25 × 60 | 288 | 33 | 2 | 25 × 60 | 288 | 33 | 2 | 38 × 14 × 28 | 500 | 18 |
| 2.5 | 25 × 60 | 288 | 34 | 2.5 | 25 × 60 | 288 | 32 | 2.5 | 38 × 14 × 28 | 500 | 18 |
| 3 | 25 × 60 | 288 | 35 | 3 | 25 × 60 | 288 | 32 | 3 | 38 × 18 × 28 | 400 | 22 |
| 3.5 | 25 × 60 | 288 | 34 | 3.5 | 25 × 60 | 288 | 31 | 3.5 | 38 × 18 × 28 | 400 | 22 |
| 4 | 25 × 60 | 288 | 32 | 4 | 30 × 60 | 288 | 48 | 4 | 38 × 21 × 35 | 400 | 31 |
| 5 | 30 × 60 | 288 | 42 | 5 | 30 × 60 | 288 | 46 | 4.5 | 38 × 21 × 35 | 400 | 31 |
| 6 | 30 × 60 | 288 | 52 | 6 | 32 × 60 | 288 | 55 | 5 | 38 × 21 × 35 | 400 | 31 |
| 6.3 | 30 × 60 | 288 | 52 | 6.3 | 32 × 60 | 288 | 55 | 6 | 38 × 22 × 35 | 400 | 32 |
| 7 | 32 × 60 | 288 | 53 | 7 | 40 × 60 | 180 | 75 | ||||
| 8 | 32 × 60 | 288 | 51 | 8 | 40 × 60 | 180 | 72 | ||||
| 9 | 32 × 60 | 288 | 52 | 9 | 40 × 60 | 180 | 74 | ||||
| 10 | 32 × 60 | 288 | 53 | 10 | 40 × 60 | 180 | 76 | ||||
| 12 | 40 × 60 | 180 | 62 | 12 | 40 × 85 | 80 | 107 | ||||
| 14 | 40 × 60 | 180 | 65 | 14 | 40 × 85 | 80 | 99 | ||||
| 15 | 40 × 60 | 180 | 68 | 15 | 40 × 85 | 80 | 102 | ||||
| 16 | 40 × 60 | 180 | 72 | 16 | 40 × 85 | 80 | 100 | ||||
| 18 | 40 × 85 | 80 | 97 | 18 | 45 × 90 | 80 | 158 | ||||
| 20 | 40 × 85 | 80 | 100 | 20 | 45 × 100 | 80 | 160 | ||||
| 25 | 45 × 90 | 80 | 135 | 25 | 45 × 100 | 80 | 158 | ||||
| 26 | 45 × 90 | 80 | 139 | 26 | 45 × 100 | 80 | 157 | ||||
| 30 | 45 × 90 | 80 | 150 | 30 | 45 × 100 | 80 | 154 | ||||
| 32 | 45 × 100 | 80 | 158 | 32 | 45 × 100 | 80 | 152 | ||||
| 35 | 45 × 100 | 80 | 154 | 35 | 50 × 100 | 80 | 195 | ||||
| 40 | 45 × 100 | 80 | 145 | 40 | 50 × 100 | 80 | 195 | ||||
| 45 | 45 × 100 | 80 | 148 | 45 | 50 × 137 | 60 | 238 | ||||
| 50 | 50 × 100 | 80 | 190 | 50 | 50 × 137 | 60 | 238 | ||||
| 55 | 50 × 100 | 80 | 187 | 55 | 50 × 137 | 60 | 237 | ||||
| 60 | 50 × 100 | 80 | 187 | 60 | 50 × 137 | 60 | 236 | ||||
| 65 | 50 × 137 | 60 | 235 | 65 | 50 × 137 | 60 | 236 | ||||
| 70 | 50 × 137 | 60 | 240 | 70 | 50 × 137 | 60 | 238 | ||||
| 75 | 50 × 137 | 60 | 238 | 75 | 55 × 137 | 60 | 307 | ||||
| 80 | 55 × 137 | 60 | 290 | 80 | 55 × 137 | 60 | 302 | ||||
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