The Citel product with reference number 640221 appears to be part of their surge protection device (SPD) lineup, though the exact model name isn't directly listed. Here's what we can gather based on related product families and specifications:

Citel's 640221 reference is associated with their AC power surge protection devices, possibly from the DS71US series, which are DIN rail-mounted SPDs designed for industrial and commercial electrical panels.

Key Features (based on DS71US series)

• Surge Current Rating: Up to 75kA per module
• Technology: Multi-MOV (Metal Oxide Varistor)
• UL Type: UL1449 5th Edition, Type 1 Listed
• Voltage Protection Rating (VPR): 700V
• Maximum Continuous Operating Voltage (MCOV): 210V
• Connection: Screw terminal, supports solid and stranded wires
• Mounting: DIN rail
• Diagnostics: Visual fault indicator and remote contacts
• Fail-Safe Behavior: No upstream overcurrent protection required
• Environmental Ratings: NEMA 2 (IP20), -40 C to +85 C, 95% humidity
• Certifications: UL, CSA, RoHS compliant