| | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | |
| | | Is there really no surge or noise? | | |
| | | |
| | | Q-1: Doesn't Bestact need contact protection circuits even for inductive load circuits? A : Not at all. Contact protection circuits are mainly provided to avoid contact welding from the breaking of inductive load circuits and to control surge voltage. Designed to meet or exceed JEM-1230 solenoid relay standards for control use, Bestact switches break inductive load completely. By restraining surge voltages, Bestact requires no contact protection systems when used within the range of rated current. Q-2: The absence of switching surge helps in preventing noise for electronic circuits, doesn't it? A : Absolutely. Q-3: Why isn't there any switching surge? A : Unlike conventional reed switches, Bestact uses glow discharge before high surge voltages occur, providing operational characteristics that are similar to a circuit with a glow lamp in parallel with the contacts. Although it is not true that Bestact does not produce any surge, it can limit its switching surge smaller than 600V in both AC and DC circuits. Q-4: Does Bestact's good DC breaking performance come from glow discharge? A : Correct. DC inductive loads are normally broken by a long time of arc discharge. This means they normally require contact capacity sufficient to withstand the resulting heat, and a gap between the contacts to remove the arc. Bestact, however, breaks inductive loads while reducing current in the region of the glow discharge. Consequently Bestact switches produce little heat and very low contact damage. A comparison of Bestact and conventional large plug-in relays for DC breaking performance showcases the difference. Bestact has better DC breaking performance than mechanical power relays. | | |
| | | • Equivalent Circuit With Bestact Opened | | |
| | | |
| | | | | | | | | | | | | -----v Discharge at | | | | | T- | | | | | | | 400V minimum | | | | | | -----' ^ Bestact Contact -----' i | | | | | | | | | | | | | | | | |
| | | |
| | | • Voltage Between Contacts With Bestact Opened | | |
| | | |
| | | | | | | | | | | Voltage | | | | | Vb max 600V | Surge Voltage | | | | | | | | | 400V e | Glow | r \ Voltage | | | | | | | | | | Contact Open Time | | | | | | | | | | |
| | | |
| | | Surge Voltage | | |
| | | |
| | | |
| | | Voltage 0 | | |
| | | • Bestact is stronger than power relays in DC breaking performance | | |
| | | |
| | | |
| | | | | | | | | | | | ^^^^^^ | RAP-6G (Yaskawa Product) | Bestact (R14) | Bestact (R24) | | | | Rated Continuous Current | 8A | 5A | 3A | | | | Rated Operational Current 240VAC 115VDC | 3A 0.2A | 1A 0.5A | 0.5A 0.2A | | | | Electrical Life | 200,000 times at 115VDC (L/R=100ms) 0.2A | 300,000 times at 115VDC (L/R=100ms) 0.5A | 200,000 times at 115VDC (L/R=100ms) 0.2A | | | | | | | | | | | |
| | | (a) DC Breaking Characteristics of Bestact Showering Arc | | |
| | | |
| | | Voltage 0 | | |
| | | |
| | | |
| | | (b) DC Breaking Characteristics of Conventional Power Relays | | |
| | | 5 | | |
| | | |
| | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | |