ABB Sper 1C1 Modules - Sper 1C1-AAJ

Technical Dossier

Product Details And Specifications

ABB Sper 1C1 Series Technical Notes

The ABB Sper 1C1 series is a dedicated line of trip circuit supervision (TCS) relays engineered for continuous monitoring of circuit breaker trip coil circuits in high-criticality industrial environments. These devices are deployed across global heavy industry sectors including petrochemical refineries, nuclear power stations, offshore platforms, and large-scale chemical processing plants. Their primary function is to detect open-circuit or high-resistance faults in the trip circuit before a fault condition demands breaker operation — a failure mode that, if undetected, results in catastrophic protection system failure.

The Evolution of Sper 1C1 Architecture

The Sper 1C1 product line was introduced by ABB (formerly BBC Brown Boveri) as part of its static relay portfolio in the late 1980s, replacing electromechanical supervision schemes that required manual periodic testing. The original Sper 1C1 variants operated on a DC voltage monitoring principle, injecting a low-level supervisory current through the trip circuit and alarming on loss of continuity.

First-generation units (pre-2000) used discrete analog circuitry with fixed threshold detection, compatible with 24 VDC to 250 VDC auxiliary supply ranges. These units were designed for single-channel supervision and provided a single output relay contact for alarm or trip initiation.

Second-generation variants introduced dual-channel supervision capability, allowing simultaneous monitoring of both the trip coil circuit and the close coil circuit from a single module. Auxiliary voltage range was extended, and LED indication was standardized across the range. Compatibility with ABB's COMBIFLEX relay system was formalized during this period.

Sper 1C1 Full Catalog & Functionalities (SKU List)

Trip Circuit Supervision Relays — Single Channel

• Sper 1C1-AAJ: Single-channel TCS relay, 24–250 VDC aux, 1 output contact, DIN-rail mount
• Sper 1C1-AAK: Single-channel TCS relay, 110–250 VDC aux, enhanced EMC, panel mount
• Sper 1C1-AAL: Single-channel TCS relay, 24–48 VDC aux, low-voltage substation variant
• Sper 1C1-AAM: Single-channel TCS relay, 110 VDC aux, fixed threshold, COMBIFLEX compatible
• Sper 1C1-AAN: Single-channel TCS relay, 220 VDC aux, high-voltage switchgear variant

Trip Circuit Supervision Relays — Dual Channel

• Sper 1C1-BAJ: Dual-channel TCS relay, monitors trip + close coil circuits, 24–250 VDC
• Sper 1C1-BAK: Dual-channel TCS relay, 110–250 VDC, 2 independent output contacts
• Sper 1C1-BAL: Dual-channel TCS relay, 24–48 VDC, compact DIN-rail housing
• Sper 1C1-BAM: Dual-channel TCS relay, 220 VDC, extended temperature range −25°C to +70°C

Trip Circuit Supervision Relays — With Watchdog / Self-Monitoring Output

• Sper 1C1-CAJ: Single-channel TCS with internal watchdog output, 24–250 VDC
• Sper 1C1-CAK: Dual-channel TCS with watchdog, 110–250 VDC, IEC 61508 SIL 1 rated
• Sper 1C1-CAL: Dual-channel TCS with watchdog, 24–48 VDC, nuclear-grade documentation available

Auxiliary & Accessory Modules

• Sper 1C1-DAJ: Plug-in test socket adapter for Sper 1C1 COMBIFLEX case, 8-pin
• Sper 1C1-DAK: Shorting link assembly for in-service relay withdrawal without trip circuit interruption
• Sper 1C1-DAL: Mounting rail adapter, converts COMBIFLEX case to standard 35 mm DIN-rail
• Sper 1C1-DAM: Terminal block cover set, IP20 finger-safe, for panel-mount installations

Sourcing Hard-to-Find & Obsolete Sper 1C1 Parts

DriveKNMS also supports engineering teams performing lifecycle extension assessments by providing technical datasheets, application notes, and cross-reference data for Sper 1C1 variants against current ABB catalog equivalents. Where a direct replacement is unavailable, DriveKNMS can advise on compatible alternatives within the ABB Sper and REB product families.

Quality Control for the Sper 1C1 Range

Trip circuit supervision relays present specific testing challenges due to their supervisory function: the relay must correctly detect a high-resistance fault condition (typically >1 kΩ in the trip circuit) while remaining stable under normal operating conditions with the trip coil energized. Standard relay test benches are insufficient for this purpose.

DriveKNMS applies a dedicated test protocol for all Sper 1C1 units prior to dispatch:

• Auxiliary supply injection across the full rated voltage range (24 VDC to 250 VDC as applicable) with measurement of quiescent current draw
• Trip circuit simulation using calibrated resistance substitution to verify alarm threshold accuracy (typically 1 kΩ ±10%)
• Output contact continuity and isolation resistance measurement per IEC 60255-1
• Insulation resistance test at 500 VDC between all isolated circuit groups
• LED indication verification under all operating states (healthy, alarm, auxiliary supply loss)
• Watchdog output functional test (applicable to -CAJ/-CAK/-CAL variants)
• Thermal soak at 55°C for 2 hours to screen latent component failures

All test results are recorded and supplied with the unit. Units failing any parameter are quarantined and not offered for sale.