Siemens 6EP1961-2BA11 SITOP PSE200U Selectivity Module 3A. Siemens 6EP1961-2BA11 Power Supply Accessory - SITOP PSE200U 3 A selectivity module 4-channel input: 24 V DC/12 A output: 24 V DC/4x 3 A threshold value adjustable 0.5-3 A with common signaling contact. Input: 24 V DC/12 A, Output: 24 V DC/4x 3 A threshold value adjustable 0.5-3 A with common signaling contact.