BA/BB Varistor Series

Transcription

1 The BA and BB Series transient surge suppressors are heavy-duty industrial metal-oxide varistors (MOVs) designed to provide surge protection for motor controls and power supplies used in oil-drilling, mining, transportation equipment and other heavy industrial AC line applications. These UL-recognized varistors have similar package construction but differ in size and ratings.the BA models are rated from 130 to 880. The BB models from 10 to 800. Both the BA and BB Series feature improved creep and strike capability to minimize breakdown along the package surface, a package design that provides complete electrical isolation of the disc subassembly, and rigid terminals to insure secure wire contacts. See BA/BB Series Device Ratings and Specifications table for part number and brand information. Features High Energy Absorption Capability W TM BA Series J BB Series ,000J Wide Operating Voltage Range RMS BA Series V to 880V BB Series V to 800V Rigid Terminals for Secure Wire Contact Case Design Provides Complete Electrical Isolation of Disc Subassembly Littelfuse Largest Packaged Disc mm Diameter No Derating Up to 85 o C Ambient AGENCY APPROVALS: Recognized under the components program of Underwriters Laboratories (BA Series only). AGENCY FILE NUMBERS: UL E BB SERIES BA SERIES 7

2 Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous: Steady State Applied Voltage: BA SERIES BB SERIES UNITS AC Voltage Range (RMS ) to to 800 V DC Voltage Range (V M(DC) ) to to 30 V Transient: Peak Pulse Current (I TM ) For 8/0µs Current Wave (See Figure ) ,000 to 70,000 70,000 A Single Pulse Energy Range For ms Current Squarewave (W TM ) to to,000 J Operating Ambient Temperature Range (T A ) to to 85 0 C Storage Temperature Range (T STG ) to to 15 0 C Temperature Coefficient (αv) of Clamping Voltage (V C ) at Specified Test Current <0.01 <0.01 %/ 0 C Hi-Pot Encapsulation (Isolation Voltage Capability) V (Dielectric must withstand indicated DC voltage for one minute per MIL-STD 0, Method 301) Insulation Resistance MΩ CAUTION: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. PRODUCTS Device Ratings and Specifications MAXIMUM RATINGS (85 o C) SPECIFICATIONS (5 o C) CONTINUOUS TRANSIENT V RMS V DC (ms) ENERGY PEAK CURRENT (8/0µs) VOLTAGE AT 1mA DC TEST CURRENT MAX CLAMPING VOLT V C AT 00A CURRENT (8/0µs) TYPICAL CAPACI- TANCE PART NUMBER AND DEVICE BRANDING V M(DC) W TM (J) I TM (A) MIN V N(DC) MAX V C f = 1MHz (pf) V131BA V151BA V51BA V71BA V31BA V41BA V481BA V511BA V571BA V661BA V751BA V881BA V11BB V14BB V17BB V0BB V4BB V8BB NOTE: Average power dissipation of transients not to exceed.5w. See Figures 3 and 4 for more information on power dissipation. 73

3 Power Dissipation Ratings Should transients occur in rapid succession, the average power dissipation required is simply the energy (watt-seconds) per pulse times the number of pulses per second. The power so developed must be within the specifications shown on the Device Ratings and Characteristics table for the specific device. Furthermore, the operating values need to be derated at high temperatures as shown in Figure 1. Because varistors can only dissipate a relatively small amount of average power they are, therefore, not suitable for repetitive applications that involve substantial amounts of average power dissipation. PERCENT OF RATED VALUE AMBIENT TEMPERATURE ( o C) PERCENT OF PEAK VALUE 0 90 O 1 = Virtual Origin of Wave T = Time From % to 90% of Peak T 1 = Virtual Front Time = 1.5 t T = Virtual Time to Half Value (Impulse Duration) Example: For an 8/0µs Current Waveform: 8µs = T 1 = Virtual Front Time 0µs = T = Virtual Time to Half Value O 1 T T 1 TIME T FIGURE. PEAK PULSE CURRENT TEST WAVEFORM Typical Performance Curves POWER DISSIPATION (W) PER kv OF RATED V RMS TYPICAL TEMPERATURE COEFFICIENT OF POWER DISSIPATION =.%/ o C MAX AT T A = 85 o C MAX AT T A = 5 o C TYP AT T A = 5 o C PERCENTAGE OF MAXIMUM RATED V RMS (%) POWER DISSIPATION (W) PER kv OF RATED V RMS HOURS, T A = 85 o C TIME AT RATED V RMS (HOURS) FIGURE 3. STANDBY POWER DISSIPATION vs APPLIED V RMS AT VARIED TEMPERATURES FIGURE 4. TYPICAL STABILITY OF STANDBY POWER DISSIPATION AT RATED V RMS vs TIME 74

4 Transient V-I Characteristics Curves MAXIMUM PEAK VOLTS 6,000 4,000 3, MAX CLAMPING VOLTAGE 130 TO 880 RATING T A = -55 o C TO 85 o C V881BA60 V751BA60 V661BA60 V571BA60 V31BA60 V71BA60 V51BA60 V151BA60 V131BA60 V511BA60 V481BA60 V41BA PEAK AMPERES (A) FIGURE 5. CLAMPING VOLTAGE FOR V131BA60 - V881BA60 MAX PEAK VOLTS 30,000 0,000,000 9,000 8,000 7,000 6,000 V8BB60 V4BB60 4,000 V0BB60 V17BB60 3,000 V14BB60 V11BB60 MAX CLAMPING VOLTAGE 10 TO 800 RATING T A = -55 o C TO 85 o C PEAK AMPERES (A) FIGURE 6. CLAMPING VOLTAGE FOR V11BB60 - V8BB60 PRODUCTS Pulse Rating Curves SURGE CURRENT (A),000 0,000,000 1 V131BA60 - V31BA INDEFINITE 0 0,000 IMPULSE DURATION (µs) FIGURE 7. SURGE CURRENT RATING CURVES FOR V131BA60 - V31BA60 SURGE CURRENT (A) 0,000,000 0,000,000 1 V41BA60 - V8BB INDEFINITE 0 0,000 IMPULSE DURATION (µs) FIGURE 8. SURGE CURRENT RATING CURVES FOR V41BA60 - V8BB60 NOTE: If pulse ratings are exceeded, a shift of V N(DC) (at specified current) of more than ±% could result.this type of shift, which normally results in a decrease of V N(DC), may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection. 75

5 Mechanical Dimensions BA SERIES BB SERIES 0±1 (3.94±.039") CL 3.5±.75 (.95±.030") 7.0 (0.8) C L NOTES: 1. Typical weight: BA.....g BB...600g Dimensions are in mm; inches in parentheses for reference only. Ordering Information V XX X XX 60 DISC SIZE (60mm) First Significant Digits SERIES DESIGNATOR Decade Multiplier 76