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| PartNumber | B551 | B551-2 | B551-2T |
| Description | BW BCR2 250 TO 5/8 | Thyristor SCR Module 400V 250A 4-Pin | Discrete Semiconductor Modules MOD DIODE SCR 25A 120VAC .250inQC |
| Manufacturer | S | - | Crydom Co. |
| Product Category | IC Chips | - | Thyristors - SCRs - Modules |
| Series | - | - | - |
| Packaging | - | - | Bulk |
| Package Case | - | - | Module |
| Mounting Type | - | - | Chassis Mount |
| Structure | - | - | 1-Phase Controller - All SCRs |
| Current Hold Ih Max | - | - | - |
| Voltage Off State | - | - | 400V |
| Current Gate Trigger Igt Max | - | - | 60mA |
| Current On State It AV Max | - | - | - |
| Current On State It RMS Max | - | - | 25A (DC) |
| Current Non Rep# Surge 50 60Hz Itsm | - | - | 250A @ 60Hz |
| Number of SCRs Diodes | - | - | 2 SCRs |