Medical Part Wirewound Ceramic Cement Cylindrical Fixed Resistor 1W~100W 5Ohm 5%
What's cement resistor ?
Cement resistors are resistors potted with cement (in fact, it is not cement but refractory mud, which is commonly called), that is, the resistance wire is wound on a non-alkaline heat-resistant porcelain piece, and the outside is heat-resistant, moisture-resistant and corrosion-resistant The material is protected and fixed, and the wire-wound resistor is placed in a square porcelain frame, with special non-combustible heat resistance.
Cement filled and sealed. There are two types of cement resistors: ordinary cement resistors and cement wire wound resistors. The appearance of the cement resistor is shown in the figure. Cement resistors are a type of wire wound resistors, which are relatively powerful resistors that can allow relatively large currents to pass. Its function is the same as a general resistance, but it can be used in large current situations, such as connecting in series with a motor to limit the starting current of the motor, and the resistance is generally not large. Cement resistors have the characteristics of large size, shock resistance, humidity resistance, heat resistance, good heat dissipation, and low price. They are widely used in power adapters, audio equipment, audio frequency dividers, instruments, meters, televisions, automobiles and other equipment.
Applications Of The Ceramic Cement Cylindrical Fixed Resistor
Instrumentation, TV's and audio systems, video recorders, comput ordenadores
• Automotive electronics
• Industrial electronics
• Power supplies
• White goods
• Pre-charged applications
Features Of The Ceramic Cement Cylindrical Fixed Resistor
• Ceramic casing
• High power dissipation in small design
• Non-flammable coating conforming to UL 94 V-0
• Excellent pulse load capability
• Non-inductive (NI) version available
• Form lead bending available for SMD mounting
• Low noise
• Excellent insulation being used in PCB
• Instant overload capability
• Long-term stability
• Excellent heat dissipation
• Small linear temperature coefficient
• Metal oxide film cutting core can offer high range resistance
Performances Of The Ceramic Cement Cylindrical Fixed Resistor
| Rated power | Maximum working voltage | Maximum overload voltage | Dielectric withstanding voltage | Max Intermittence Overload Voltage |
| 1W | 350V | 700V | 1000V | 1500V |
| 2W | 350V | 700V | 1000V | 1500V |
| 3W | 500V | 1000V | 1000V | 1500V |
| 5W | 750V | 1500V | 1000V | 1500V |
| 7W | 1000V | 1500V | 1000V | 1500V |
| 10W | 1000V | 1500V | 1000V | 1500V |
| 15W | 1000V | 15000V | 1000V | 1500V |
| 20W | 1000V | 1500V | 1000V | 1500V |
| 30W | 1000V | 1500V | 1000V | 1500V |
| 40W | 1000V | 1500V | 1000V | 1500V |
Material Of The Ceramic Cement Cylindrical Fixed Resistor
| NO | Item | Material |
| 1 | Ceramic core | High alumina ceramic is used. |
| 2 | Resistor element | The resistor element shall consist of metal oxide film or Resistance wire (Exemple:CN49W Φ1.0mm) . |
| 3 | Terminal | Tinned iron cap. |
| 4 | Connection | The lead wire,which is plated with solder,shall be mounted to the caps by welding process. |
| 5 | Lead wire t | Soldered or tinned annealed wire. |
| 6 | Silicon cement | Silicon resin is used. Accord with UL-94V-0 Nonflammable specification |
| 7 | Ceramic case | High thermal conductivity |
Dimension Of The Ceramic Cement Cylindrical Fixed Resistor (mm)
| Watt | Dimensions(mm) | Resistance Range(Ω) |
| L | W | H | Φd±0.05 | Wire Wound | Metal Oxide Film |
| 1W | 14±1.0 | 6.5±1.0 | 6.5±1.0 | 0.50 | 0.1Ω~22Ω | 25Ω~56KΩ |
| 2W | 18±1.0 | 7.0±1.0 | 7.0±1.0 | 0.50 | 0.1Ω~22Ω | 25Ω~56KΩ |
| 3W | 22±1.0 | 8.0±1.0 | 8.0±1.0 | 0.68 | 0.1Ω~47Ω | 50Ω~100KΩ |
| 5W | 22±1.0 | 9.5±1.0 | 9.5±1.0 | 0.68 | 0.1Ω~47Ω | 50Ω~100KΩ |
| 7W | 35±1.5 | 9.5±1.5 | 9.5±1.5 | 0.68 | 0.5Ω~330Ω | 450Ω~100KΩ |
| 10W | 48±1.5 | 9.5±1.5 | 9.5±1.5 | 0.68 | 0.5Ω~450Ω | 470Ω~100KΩ |
| 15W | 48±1.5 | 13±1.5 | 13±1.5 | 0.68 | 1Ω~500Ω | 510Ω~100KΩ |
| 20W | 63±1.5 | 13±1.5 | 13±1.5 | 0.68 | 1Ω~600Ω | 620Ω~100KΩ |
| 30W | 75±2.0 | 19±2.0 | 17±2.0 | 0.68 | 1Ω~600Ω | 620Ω~100KΩ |
| 40W | 89±2.0 | 19±2.0 | 19±2.0 | 0.68 | 1Ω~600Ω | 620Ω~100KΩ |
| Watt | Dimensions(mm) | Resistance Range(Ω) |
| W±1.0 | S±1.0 | H±1.5 | Φd±0.05 | P±1.0 | Wire Wound | Metal Oxide Film |
| 2W | 11.5 | 7.5 | 20.5 | 0.50 | 4.5 | 0.1Ω~47Ω | 50Ω~100KΩ |
| 3W | 12 | 8.5 | 25 | 0.68 | 4.5 | 0.1Ω~47Ω | 50Ω~100KΩ |
| 5W | 13 | 9.5 | 25 | 0.68 | 4.5 | 0.1Ω~47Ω | 50Ω~100KΩ |
| 7W | 13 | 9.5 | 38 | 0.68 | 4.5 | 0.5Ω~330Ω | 450Ω~100KΩ |
| 10W | 13 | 9.5 | 52 | 0.68 | 4.5 | 0.5Ω~450Ω | 470Ω~100KΩ |
| 10W | 16 | 11.5 | 36 | 0.68 | 4.5 | 0.5Ω~450Ω | 470Ω~100KΩ |
Construction Of The Ceramic Cement Cylindrical Fixed Resistor
Power Derating Curve Of The Ceramic Cement Cylindrical Fixed Resistor
Characteristics Of The Ceramic Cement Cylindrical Fixed Resistor
| Item | Performance | Test methods(Conform to JIS C 5202) |
| Temperature Coefficient | Metal Oxide Film:±350PPM/℃ Resistor Wire:±260PPM/℃ | Comply with 5.2 R1-R0 R0(T1-T0) R0:Resistance value at room temp.( T0). R1:Resistance value at room temp.plus 100℃ (T1) |
| Short time overload | Within ±(2%+0.05Ω). No evidence of mechanical damage. | Comply with 5.5 Rated power×10 times,5s But not to exceed maximum overload voltage. (See table-1) |
| Insulation Resistance | 103MΩ or more. | Comply with 5.6 Resistor shall be tested at DC 500V for 60 seconds. |
| Dielectric Withstanding Voltage | No evidence of flashover mechanical damage,arcing or insulation breakdown. | Comply with 5.7 Resistor shall be tested at AC potential respecticely for 60 seconds. (See table-1) |
| Pulse overload | ±(2%+0.05Ω)以內. Within ±(2%+0.05Ω) | Comply with 5.8 Rated voltage X 4 times, 10000 cyc.(1s ON, 25s OFF) But not to exceed maximum pulse voltage. (See table-1) |
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